# Changelog¶

kitty is a feature full, cross-platform, fast, GPU based terminal emulator.

## 0.12.3 [2018-09-29]¶

• macOS: Fix kitty window not being rendered on macOS Mojave until the window is moved or resized at least once (#887)
• Unicode input: Fix an error when searching for the string 'fir' (#1035)

## 0.12.2 [2018-09-24]¶

• A new last_used_layout function that can be mapped to a shortcut to switch to the previously used window layout (#870)
• New neighboring_window and move_window functions to switch to neighboring windows in the current layout, and move them around, similar to window movement in vim (#916)
• A new pipe function that can be used to pipe the contents of the screen and scrollback buffer to any desired program running in a new window, tab or overlay window. (#933)
• Add a new kitty --start-as command line flag to start kitty full-screen/maximized/minimized. This replaces the --start-in-fullscreen flag introduced in the previous release (#935)
• When mapping the new_tab action allow specifying that the tab should open next to the current tab instead of at the end of the tabs list (#979)
• macOS: Add a new macos_thicken_font to make text rendering on macs thicker, which makes it similar to the result of sub-pixel antialiasing (#950)
• macOS: Add an option macos_traditional_fullscreen to make full-screening of kitty windows much faster, but less pretty. (#911)
• Fix a bug causing incorrect line ordering when viewing the scrollback buffer if the scrollback buffer is full (#960)
• Fix drag-scrolling not working when the mouse leaves the window confines (#917)
• Workaround for broken editors like nano that cannot handle newlines in pasted text (#994)
• Linux: Ensure that the python embedded in the kitty binary build uses UTF-8 mode to process command-line arguments (#924)
• Linux: Handle fonts that contain monochrome bitmaps (such as the Terminus TTF font) (#934)
• Have the kitty --title flag apply to all windows created using kitty --session (#921)
• Revert change for backspacing of wide characters in the previous release, as it breaks backspacing in some wide character aware programs (#875)
• Fix kitty @set-colors not working for tab backgrounds when using the fade tabbar style (#937)
• macOS: Fix resizing semi-transparent windows causing the windows to be invisible during the resize (#941)
• Linux: Fix window icon not set on X11 for the first OS window (#961)
• macOS: Add an macos_custom_beam_cursor option to use a special mouse cursor image that can be seen on both light and dark backgrounds (#359)
• Remote control: Fix the focus_window command not focusing the top-level OS window of the specified kitty window (#1003)
• Fix using focus_follows_mouse causing text selection with the mouse to malfunction when using multiple kitty windows (#1002)

## 0.12.1 [2018-09-08]¶

• Add a new --start-in-fullscreen command line flag to start kitty in full screen mode (#856)
• macOS: Fix a character that cannot be rendered in any font causing font fallback for all subsequent characters that cannot be rendered in the main font to fail (#799)
• Linux: Do not enable IME input via ibus unless the GLFW_IM_MODULE=ibus environment variable is set. IME causes key processing latency and even missed keystrokes for many people, so it is now off by default.
• Fix backspacing of wide characters in wide-character unaware programs not working (#875)
• Linux: Fix number pad arrow keys not working when Numlock is off (#857)
• Wayland: Implement support for clipboard copy/paste (#855)
• Allow mapping shortcuts using the raw key code from the OS (#848)
• Allow mapping of individual key-presses without modifiers as shortcuts
• Fix legacy invocation of icat as kitty icat not working (#850)
• Improve rendering of wavy underline at small font sizes (#853)
• Fix a regression in 0.12.0 that broke dynamic resizing of layouts (#860)
• Wayland: Allow using the kitty --class command line flag to set the app id (#862)
• Add completion of the kitty command for the fish shell (#829)
• Linux: Fix XCompose rules with no defined symbol not working (#880)
• Linux: Fix crash with some Nvidia drivers when creating tabs in the first top level-window after creating a second top-level window. (#873)
• macOS: Diff kitten: Fix syntax highlighting not working because of a bug in the 0.12.0 macOS package

## 0.12.0 [2018-09-01]¶

• Preserve the mouse selection even when the contents of the screen are scrolled or overwritten provided the new text does not intersect the selected lines.
• Linux: Implement support for Input Method Extensions (multilingual input using standard keyboards) via IBus (#469)
• Implement completion for the kitty command in bash and zsh. See Completion for kitty.
• Render the text under the cursor in a fixed color, configurable via the option cursor_text_color (#126)
• Add an option env to set environment variables in child processes from kitty.conf
• Implement high precision scrolling with the trackpad on platforms such as macOS and Wayland that implement it. (#819)
• macOS: Allow scrolling window contents using mouse wheel/trackpad even when the window is not the active window (#729)
• Remote control: Allow changing the current window layout with a new kitty @ goto-layout command (#845)
• Remote control: Allow matching windows by the environment variables of their child process as well
• Allow running kittens via the remote control system (#738)
• Allow enabling remote control in only some kitty windows
• Add a keyboard shortcut to reset the terminal (ctrl+shift+delete). It takes parameters so you can define your own shortcuts to clear the screen/scrollback also (#747)
• Fix one-pixel line appearing at window edges at some window sizes when displaying images with background opacity enabled (#741)
• diff kitten: Fix error when right hand side file is binary and left hand side file is text (#752)
• kitty @ new-window: Add a new option kitty @ new-window --window-type to create top-level OS windows (#770)
• macOS: The focus_follows_mouse option now also works across top-level kitty OS windows (#754)
• Fix detection of URLs in HTML source code (URLs inside quotes) (#785)
• Implement support for emoji skin tone modifiers (#787)
• Round-trip the zwj unicode character. Rendering of sequences containing zwj is still not implemented, since it can cause the collapse of an unbounded number of characters into a single cell. However, kitty at least preserves the zwj by storing it as a combining character.
• macOS: Disable the custom mouse cursor. Using a custom cursor fails on dual GPU machines. I give up, Apple users will just have to live with the limitations of their choice of OS. (#794)
• macOS: Fix control+tab key combination not working (#801)
• Linux: Fix slow startup on some systems caused by GLFW searching for joysticks. Since kitty does not use joysticks, disable joystick support. (#830)

## 0.11.3 [2018-07-10]¶

• Draw only the minimum borders needed for inactive windows. That is only the borders that separate the inactive window from a neighbor. Note that setting a non-zero window margin overrides this and causes all borders to be drawn. The old behavior of drawing all borders can be restored via the draw_minimal_borders setting in kitty.conf. (#699)
• macOS: Add an option macos_window_resizable to control if kitty top-level windows are resizable using the mouse or not (#698)
• macOS: Use a custom mouse cursor that shows up well on both light and dark backgrounds (#359)
• macOS: Workaround for switching from fullscreen to windowed mode with the titlebar hidden causing window resizing to not work. (#711)
• Fix triple-click to select line not working when the entire line is filled (#703)
• When dragging to select with the mouse "grab" the mouse so that if it strays into neighboring windows, the selection is still updated (#624)
• When clicking in the margin/border area of a window, map the click to the nearest cell in the window. Avoids selection with the mouse failing when starting the selection just outside the window.
• When drag-scrolling stop the scroll when the mouse button is released.
• Fix a regression in the previous release that caused pasting large amounts of text to be duplicated (#709)

## 0.11.2 [2018-07-01]¶

• Linux: Allow using XKB key names to bind shortcuts to keys not supported by GLFW (#665)
• kitty shell: Ignore failure to read readline history file. Happens if the user migrates their kitty cache directory between systems with incompatible readline implementations.
• macOS: Fix an error in remote control when using --listen-on (#679)
• hints kitten: Add a kitty +kitten hints --multiple option to select multiple items (#687)
• Fix pasting large amounts of text very slow (#682)
• Add an option single_window_margin_width to allow different margins when only a single window is visible in the layout (#688)
• Add a kitty --hold command line option to stay open after the child process exits (#667)
• diff kitten: When triggering a search scroll to the first match automatically
• kitty --debug-font-fallback also prints out what basic fonts were matched
• When closing a kitty window reset the mouse cursor to its default shape and ensure it is visible (#655).
• Remote control: Speed-up reading of command responses
• Linux installer: Fix installer failing on systems with python < 3.5
• Support "-T" as an alias for "--title" (#659)
• Fix a regression in the previous release that broke using kitty --debug-config with custom key mappings (#695)

## 0.11.0 [2018-06-12]¶

• A new tab bar style "fade" in which each tab's edges fade into the background. See tab_bar_style and tab_fade for details. The old look can be restored by setting tab_bar_style to separator.
• Pre-compiled binaries with all bundled dependencies for Linux (#595)
• A new kitten to create dock panels on X11 desktops showing the output from arbitrary terminal programs.
• Reduce data sent to the GPU per render by 30% (commit: 8dea5b3e)
• Implement changing the font size for individual top level (OS) windows (#408)
• When viewing the scrollback in less using ctrl+shift+h and kitty is currently scrolled, position the scrollback in less to match kitty's scroll position. (#148)
• ssh kitten: Support all SSH options. It can now be aliased directly to ssh for convenience. (#591)
• icat kitten: Add kitty +kitten icat --print-window-size to easily detect the window size in pixels from scripting languages (#581)
• hints kitten: Allow selecting hashes from the terminal with ctrl+shift+p>h useful for git commits. (#604)
• Allow specifying initial window size in number of cells in addition to pixels (#436)
• Add a setting to control the margins to the left and right of the tab-bar (#584)
• When closing a tab switch to the last active tab instead of the right-most tab (#585)
• Wayland: Fix kitty not starting when using wl_roots based compositors (#157)
• Wayland: Fix mouse wheel/touchpad scrolling in opposite direction to other apps (#594)
• macOS: Fix the new OS window keyboard shortcut (ctrl+shift+n) not working if no kitty window currently has focus. (#524)
• macOS: Keep kitty running even when the last window is closed. This is in line with how applications are supposed to behave on macOS (#543). There is a new option (macos_quit_when_last_window_closed) to control this.
• macOS: Add macOS standard shortcuts for copy, paste and new OS window (⌘+C, ⌘+V, ⌘+N)
• Add a config option (editor) to set the EDITOR kitty uses (#580)
• Add a config option (x11_hide_window_decorations) to hide window decorations under X11/Wayland (#607)
• Add an option to @set-window-title to make the title change non-permanent (#592)
• Add support for the CSI t escape code to query window and cell sizes (#581)
• Linux: When using layouts that map the keys to non-ascii characters, map shortcuts using the ascii equivalents, from the default layout. (#606)
• Linux: Fix fonts not being correctly read from TrueType Collection (.ttc) files (#577)
• Fix inactive_text_alpha also applying to the tab bar (#612)
• hints kitten: Fix a regression that caused some blank lines to be not be displayed.
• Linux: Include a man page and the HTML docs when building the linux-package
• Remote control: Fix kitty @ sometimes failing to read the response from kitty. (#614)
• Fix kitty @ set-colors not working with the window border colors. (#623)
• Fix a regression in 0.10 that caused incorrect rendering of the status bar in irssi when used inside screen. (#621)

## 0.10.1 [2018-05-24]¶

• Add a kitten to easily ssh into servers that automatically copies the terminfo files over. kitty +kitten ssh myserver.
• diff kitten: Make the keyboard shortcuts configurable (#563)
• Allow controlling background_opacity via either keyboard shortcuts or remote control. Note that you must set dynamic_background_opacity yes in kitty.conf first. (#569)
• diff kitten: Add keybindings to scroll by page
• diff kitten: Fix incorrect syntax highlighting for a few file formats such as yaml
• macOS: Fix regression that caused the macos_option_as_alt setting to always be disabled for all OS windows in a kitty instance after the first window (#571)
• Fix Ctrl+Alt+Space not working in normal and application keyboard modes (#562)

## 0.10.0 [2018-05-21]¶

• A diff kitten to show side-by-side diffs with syntax highlighting and support for images. See diff kitten.
• Make windows in the various kitty layouts manually resizable. See Layouts for details.
• Implement support for the SGR faint escape code to make text blend into the background (#446).
• Make the hints kitten a little smarter (commit: ad1109b6) so that URLs that stretch over multiple lines are detected. Also improve detection of surrounding brackets/quotes.
• Make the kitty window id available as the environment variable KITTY_WINDOW_ID (#532).
• Add a "fat" layout that is similar to the "tall" layout but vertically oriented.
• Expand environment variables in config file include directives
• Allow programs running in kitty to read/write from the clipboard (commit: 889ca779). By default only writing is allowed. This feature is supported in many terminals, search for OSC 52 clipboard to find out more about using it.
• Fix moving cursor outside a defined page area incorrectly causing the cursor to be placed inside the page area. Caused incorrect rendering in neovim, in some situations (#542).
• Render a couple more powerline symbols directly, bypassing the font (#550).
• Fix ctrl+alt+<special> not working in normal and application keyboard (#548).
• Partial fix for rendering Right-to-left languages like Arabic. Rendering of Arabic is never going to be perfect, but now it is at least readable.
• Fix Ctrl+backspace acting as plain backspace in normal and application keyboard modes (#538).
• Have the paste_from_selection action paste from the clipboard on platforms that do not have a primary selection such as Wayland and macOS (#529)
• Fix cursor_stop_blinking_after=0 not working (#530)

## 0.9.1 [2018-05-05]¶

• Show a bell symbol on the tab if a bell occurs in one of the windows in the tab and the window is not the currently focused window
• Change the window border color if a bell occurs in an unfocused window. Can be disabled by setting the bell_border_color to be the same as the inactive_border_color.
• Unicode input: When searching by name search for prefix matches as well as whole word matches
• Dynamically allocate the memory used for the scrollback history buffer. Reduces startup memory consumption when using very large scrollback buffer sizes.
• Add an option to not request window attention on bell.
• Remote control: Allow matching windows by number (visible position).
• macOS: Fix changing tab title and kitty shell not working
• When triple-clicking select all wrapped lines belonging to a single logical line.
• hints kitten: Detect bracketed URLs and don't include the closing bracket in the URL.
• When calling pass_selection_to_program use the current directory of the child process as the cwd of the program.
• macOS: When the macos_titlebar_color is set to background change the titlebar colors to match the current background color of the active kitty window
• Add a setting to clear all shortcuts defined up to that point in the config file(s)
• Add a setting (kitty_mod) to change the modifier used by all the default kitty shortcuts, globally
• Fix Shift+function key not working
• Support the F13 to F25 function keys
• Don't fail to start if the user deletes the hintstyle key from their fontconfig configuration.
• When rendering a private use unicode codepoint and a space as a two cell ligature, set the foreground colors of the space cell to match the colors of the first cell. Works around applications like powerline that use different colors for the two cells.
• Fix passing @text to other programs such as when viewing the scrollback buffer not working correctly if kitty is itself scrolled up.
• Fix window focus gained/lost events not being reported to child programs when switching windows/tabs using the various keyboard shortcuts.
• Fix tab title not changing to reflect the window title when switching between different windows in a tab
• Ignore -e if it is specified on the command line. This is for compatibility with broken software that assumes terminals should run with an -e option to execute commands instead of just passing the commands as arguments.

## 0.9.0 [2018-04-15]¶

• A new kitty command shell to allow controlling kitty via commands. Press ctrl+shift+escape to run the shell.
• The hints kitten has become much more powerful. Now in addition to URLs you can use it to select word, paths, filenames, lines, etc. from the screen. These can be inserted into the terminal, copied to clipboard or sent to external programs.
• Linux: Switch to libxkbcommon for keyboard handling. It allows kitty to support XCompose and dead keys and also react to keyboard remapping/layout change without needing a restart.
• Add support for multiple-key-sequence shortcuts
• A new remote control command set-colors to change the current and/or configured colors.
• When double-clicking to select a word, select words that continue onto the next/prev line as well.
• Add an include directive for the config files to read multiple config files
• Improve mouse selection for windows with padding. Moving the mouse into the padding area now acts as if the mouse is over the nearest cell.
• Allow setting all 256 terminal colors in the config file
• Fix using kitty --single-instance to open a new window in a running kitty instance, not respecting the --directory flag
• URL hints: Exclude trailing punctuation from URLs
• URL hints: Launch the browser from the kitty parent process rather than the hints kitten. Fixes launching on some systems where xdg-open doesn't like being run from a kitten.
• Allow using rectangle select mode by pressing shift in addition to the rectangle select modifiers even when the terminal program has grabbed the mouse.

## 0.8.4 [2018-03-31]¶

• Fix presence of XDG_CONFIG_DIRS and absence of XDG_CONFIG_HOME preventing kitty from starting
• Revert change in last release to cell width calculation. Instead just clip the right edges of characters that overflow the cell by at most two pixels

## 0.8.3 [2018-03-29]¶

• Fix a regression that broke the visual bell and invert screen colors escape code
• Allow double-click and triple-click + drag to extend selections word at a time or line at a time
• Add a keyboard shortcut to set the tab title
• Fix setting window title to empty via OSC escape code not working correctly
• Linux: Fix cell width calculation incorrect for some fonts (cell widths are now calculated by actually rendering bitmaps, which is slower but more accurate)
• Allow specifying a system wide kitty config file, for all users
• Add a --debug-config command line flag to output data about the system and kitty configuration.
• Wayland: Fix auto-repeat of keys not working

## 0.8.2 [2018-03-17]¶

• Allow extending existing selections by right clicking
• Add a configurable keyboard shortcut and remote command to set the font size to a specific value
• Add an option to have kitty close the window when the main processes running in it exits, even if there are still background processes writing to that terminal
• Add configurable keyboard shortcuts to switch to a specific layout
• Add a keyboard shortcut to edit the kitty config file easily
• macOS: Fix restoring of window size not correct on Retina screens
• macOS: Add a facility to specify command line arguments when running kitty from the GUI
• Add a focus-tab remote command
• Fix screen not being refreshed immediately after moving a window.
• Fix a crash when getting the contents of the scrollback buffer as text

## 0.8.1 [2018-03-09]¶

• Extend kitty's remote control feature to work over both UNIX and TCP sockets, so now you can control kitty from across the internet, if you want to.
• Render private use unicode characters that are followed by a space as a two character ligature. This fixes rendering for applications that misuse private-use characters to display square symbols.
• Fix Unicode emoji presentation variant selector causing new a fallback font instance to be created
• Fix a rare error that prevented the Unicode input kitten from working sometimes
• Allow using Ctrl+Alt+letter in legacy keyboard modes by outputting them as Ctrl+letter and Alt+letter. This matches other terminals' behavior.
• Fix cursor position off-by-one on horizontal axis when resizing the terminal
• Wayland: Fix auto-repeat of keys not working
• Wayland: Add support for window decorations provided by the Wayland shell
• macOS: Fix URL hints not working
• macOS: Fix shell not starting in login mode on some computers
• macOS: Output errors into console.app when running as a bundle

## 0.8.0 [2018-02-24]¶

• A framework for kittens, that is, small terminal programs designed to run inside kitty and extend its capabilities. Examples include unicode input and selecting URLs with the keyboard.
• Input arbitrary unicode characters by pressing Ctrl+Shift+u. You can choose characters by name, by hex code, by recently used, etc. There is even and editable Favorites list.
• Open URLs using only the keyboard. kitty has a new "hints mode". Press Ctrl+Shift+e and all detected URLs on the screen are highlighted with a key to press to open them. The facility is customizable so you can change what is detected as a URL and which program is used to open it.
• Add an option to change the titlebar color of kitty windows on macOS
• Only consider Emoji characters with default Emoji presentation to be two cells wide. This matches the standard. Also add support for the Unicode Emoji variation presentation selector.
• Prevent video tearing during high speed scrolling by syncing draws to the monitor's refresh rate. There is a new configuration option to control this sync_to_monitor.
• When displaying only a single window, use the default background color of the window (which can be changed via escape codes) as the color for the margin and padding of the window.
• Add some non standard terminfo capabilities used by neovim and tmux.
• Fix large drop in performance when using multiple top-level windows on macOS
• Fix save/restore of window sizes not working correctly.
• Remove option to use system wcwidth(). Now always use a wcwidth() based on the Unicode standard. Only sane way.
• Fix a regression that caused a few ligature glyphs to not render correctly in rare circumstances.
• Browsing the scrollback buffer now happens in an overlay window instead of a new window/tab.

## 0.7.1 [2018-01-31]¶

• Fix selecting text with the mouse in the scrollback buffer selecting text from the line above the actually selected line
• Fix some italic fonts having the right edge of characters cut-off, unnecessarily

## 0.7.0 [2018-01-24]¶

• Allow controlling kitty from the shell prompt/scripts. You can open/close/rename windows and tabs and even send input to specific windows. See the README for details.
• Add option to put tab bar at the top instead of the bottom
• Add option to override the default shell
• Add "Horizontal" and "Vertical" window layouts
• Sessions: Allow setting titles and working directories for individual windows
• Option to copy to clipboard on mouse select
• Fix incorrect reporting of mouse move events when using the SGR protocol
• Make alt+backspace delete the previous word
• Take the mouse wheel multiplier option in to account when generating fake key scroll events
• macOS: Fix closing top-level window does not transfer focus to other top-level windows.
• macOS: Fix alt+arrow keys not working when disabling the macos_option_as_alt config option.
• kitty icat: Workaround for bug in ImageMagick that would cause some images to fail to display at certain sizes.
• Fix rendering of text with ligature fonts that do not use dummy glyphs
• Fix a regression that caused copying of the selection to clipboard to only copy the visible part of the selection
• Fix incorrect handling of some unicode combining marks that are not re-ordered
• Fix handling on non-BMP combining characters
• Drop the dependency on libunistring

## 0.6.1 [2017-12-28]¶

• Add new actions to open windows/tabs/etc. with the working directory set to the working directory of the current window.
• Automatically adjust cell size when DPI changes, for example when kitty is moved from one monitor to another with a different DPI
• Ensure underlines are rendered even for fonts with very poor metrics
• Fix some emoji glyphs not colored on Linux
• Internal wcwidth() implementation is now auto-generated from the unicode standard database
• Allow configuring the modifiers to use for rectangular selection with the mouse.
• Fix incorrect minimum wayland version in the build script
• Fix a crash when detecting a URL that ends at the end of the line
• Fix regression that broke drawing of hollow cursor when window loses focus

## 0.6.0 [2017-12-18]¶

• Support background transparency via the background_opacity option. Provided that your OS/window manager supports transparency, you can now have kitty render pixels that have only the default background color as semi-transparent.
• Support multiple top level (OS) windows. These windows all share the sprite texture cache on the GPU, further reducing overall resource usage. Use the shortcut ctrl+shift+n to open a new top-level window.
• Add support for a daemon mode using the --single-instance command line option. With this option you can have only a single kitty instance running. All future invocations simply open new top-level windows in the existing instance.
• Support colored emoji
• Use CoreText instead of FreeType to render text on macOS
• Support running on the "low power" GPU on dual GPU macOS machines
• Add a new "grid" window layout
• Drop the dependency on glfw (kitty now uses a modified, bundled copy of glfw)
• Add an option to control the audio bell volume on X11 systems
• Add a command line switch to set the name part of the WM_CLASS window property independently.
• Add a command line switch to set the window title.
• Add more options to customize the tab-bar's appearance (font styles and separator)
• Allow drag and drop of files into kitty. On drop kitty will paste the file path to the running program.
• Add an option to control the underline style for URL highlighting on hover
• X11: Set the WINDOWID environment variable
• Fix middle and right buttons swapped when sending mouse events to child processes
• Allow selecting in a rectangle by holding down Ctrl+Alt while dragging with the mouse.

## 0.5.1 [2017-12-01]¶

• Add an option to control the thickness of lines in box drawing characters
• Increase max. allowed ligature length to nine characters
• Fix text not vertically centered when adjusting line height
• Fix unicode block characters not being rendered properly
• Fix shift+up/down not generating correct escape codes
• Image display: Fix displaying images taller than two screen heights not scrolling properly

## 0.5.0 [2017-11-19]¶

• Add support for ligature fonts such as Fira Code, Hasklig, etc. kitty now uses harfbuzz for text shaping which allow it to support advanced OpenType features such as contextual alternates/ligatures/combining glyphs/etc.
• Make it easy to select fonts by allowing listing of monospace fonts using: kitty list-fonts
• Add a keyboard shortcut (ctrl+shift+f11) to toggle fullscreen mode
• macOS: Fix handling of option key. It now behaves just like the alt key on Linux. There is an option to make it type unicode characters instead.
• Linux: Add support for startup notification on X11 desktops. kitty will now inform the window manager when its startup is complete.
• Fix shell prompt being duplicated when window is resized
• Fix crash when displaying more than 64 images in the same session
• Add support for colons in SGR color codes. These are generated by some applications such as neovim when they mistakenly identify kitty as a libvte based terminal.
• Fix mouse interaction not working in apps using obsolete mouse interaction protocols
• Linux: no longer require glew as a dependency

## 0.4.2 [2017-10-23]¶

• Fix a regression in 0.4.0 that broke custom key mappings
• Fix a regression in 0.4.0 that broke support for non-QWERTY keyboard layouts
• Avoid using threads to reap zombie child processes. Also prevent kitty from hanging if the open program hangs when clicking on a URL.

## 0.4.0 [2017-10-22]¶

• Support for drawing arbitrary raster graphics (images) in the terminal via a new graphics protocol. kitty can draw images with full 32-bit color using both ssh connections and files/shared memory (when available) for better performance. The drawing primitives support alpha blending and z-index. Images can be drawn both above and below text. See The terminal graphics protocol. for details.
• Refactor kitty's internals to make it even faster and more efficient. The CPU usage of kitty + X server while doing intensive tasks such as scrolling a file continuously in less has been reduced by 50%. There are now two configuration options repaint_delay and input_delay you can use to fine tune kitty's performance vs CPU usage profile. The CPU usage of kitty + X when scrolling in less is now significantly better than most (all?) other terminals. See kitty Performance.
• Hovering over URLs with the mouse now underlines them to indicate they can be clicked. Hold down Ctrl+Shift while clicking to open the URL.
• Selection using the mouse is now more intelligent. It does not add blank cells (i.e. cells that have no content) after the end of text in a line to the selection.
• The block cursor in now fully opaque but renders the character under it in the background color, for enhanced visibility.
• Allow combining multiple independent actions into a single shortcut
• Add a new shortcut to pass the current selection to an external program
• Allow creating shortcuts to open new windows running arbitrary commands. You can also pass the current selection to the command as an arguments and the contents of the screen + scrollback buffer as stdin to the command.