Public bug reported: If I have `ខែ្` (U+1781 U+17c2 U+17d2) in the terminal and press backspace, the first backspace deletes U+17c2 U+17d2 so that I'm left with `ខ` (U+1781). Instead it should only delete the last codepoint, U+17d2.
If I have `ខែ` (U+1781 U+17c2) a backspace deletes only U+17c2, similarly if I have `ខ្` (U+1781 U+17d2) where the backspace deletes U+17d2. Further investigations show that backspace often deletes the entire cluster, i.e. diacritic(s) plus the base character, for example with `x̣́` (U+0078 U+0301 U+0323) where a backspace deletes all three codepoints. gnome-terminal should only delete the last codepoint [1]. A real live example where this behavior is problematic is when using ibus-keyman with the Khmer Angkor keyboard. When typing <kbd>x</kbd><kbd>E</kbd><kbd>j</kbd><kbd>m</kbd><kbd>r</kbd> the expected output is `ខ្មែរ` (U+1781 U+17d2 U+1798 U+17c2 U+179a). Keyman does some reordering while typing to put the codepoints in a standardized order. Because gnome-terminal lacks support for surrounding text, the codepoints have to be deleted by emitting several backspace keypresses. Because of the deletion of the cluster the result in gnome- terminal is `មែរ` (U+1798 U+17c2 U+179a). [1] https://github.com/keymanapp/keyman/wiki/Backspace-and-cluster- deletion ProblemType: Bug DistroRelease: Ubuntu 22.04 Package: gnome-terminal 3.44.0-1ubuntu1 [modified: usr/libexec/gnome-terminal-server] ProcVersionSignature: Ubuntu 6.5.0-14.14~22.04.1-generic 6.5.3 Uname: Linux 6.5.0-14-generic x86_64 ApportVersion: 2.20.11-0ubuntu82.5 Architecture: amd64 CasperMD5CheckResult: pass CurrentDesktop: ubuntu:GNOME Date: Fri Jan 26 12:21:42 2024 InstallationDate: Installed on 2022-04-12 (653 days ago) InstallationMedia: Ubuntu 22.04 LTS "Jammy Jellyfish" - Beta amd64 (20220329.1) SourcePackage: gnome-terminal UpgradeStatus: No upgrade log present (probably fresh install) ** Affects: gnome-terminal (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug jammy -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to gnome-terminal in Ubuntu. https://bugs.launchpad.net/bugs/2051371 Title: Backspace in gnome-terminal often deletes cluster Status in gnome-terminal package in Ubuntu: New Bug description: If I have `ខែ្` (U+1781 U+17c2 U+17d2) in the terminal and press backspace, the first backspace deletes U+17c2 U+17d2 so that I'm left with `ខ` (U+1781). Instead it should only delete the last codepoint, U+17d2. If I have `ខែ` (U+1781 U+17c2) a backspace deletes only U+17c2, similarly if I have `ខ្` (U+1781 U+17d2) where the backspace deletes U+17d2. Further investigations show that backspace often deletes the entire cluster, i.e. diacritic(s) plus the base character, for example with `x̣́` (U+0078 U+0301 U+0323) where a backspace deletes all three codepoints. gnome-terminal should only delete the last codepoint [1]. A real live example where this behavior is problematic is when using ibus-keyman with the Khmer Angkor keyboard. When typing <kbd>x</kbd><kbd>E</kbd><kbd>j</kbd><kbd>m</kbd><kbd>r</kbd> the expected output is `ខ្មែរ` (U+1781 U+17d2 U+1798 U+17c2 U+179a). Keyman does some reordering while typing to put the codepoints in a standardized order. Because gnome-terminal lacks support for surrounding text, the codepoints have to be deleted by emitting several backspace keypresses. Because of the deletion of the cluster the result in gnome-terminal is `មែរ` (U+1798 U+17c2 U+179a). [1] https://github.com/keymanapp/keyman/wiki/Backspace-and-cluster- deletion ProblemType: Bug DistroRelease: Ubuntu 22.04 Package: gnome-terminal 3.44.0-1ubuntu1 [modified: usr/libexec/gnome-terminal-server] ProcVersionSignature: Ubuntu 6.5.0-14.14~22.04.1-generic 6.5.3 Uname: Linux 6.5.0-14-generic x86_64 ApportVersion: 2.20.11-0ubuntu82.5 Architecture: amd64 CasperMD5CheckResult: pass CurrentDesktop: ubuntu:GNOME Date: Fri Jan 26 12:21:42 2024 InstallationDate: Installed on 2022-04-12 (653 days ago) InstallationMedia: Ubuntu 22.04 LTS "Jammy Jellyfish" - Beta amd64 (20220329.1) SourcePackage: gnome-terminal UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-terminal/+bug/2051371/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
