Bug 2125153
| Summary: | ibus does not support special Arabic compose sequences | ||
|---|---|---|---|
| Product: | [Fedora] Fedora | Reporter: | Mike FABIAN <mfabian> |
| Component: | ibus | Assignee: | fujiwara <tfujiwar> |
| Status: | CLOSED RAWHIDE | QA Contact: | Fedora Extras Quality Assurance <extras-qa> |
| Severity: | unspecified | Docs Contact: | |
| Priority: | unspecified | ||
| Version: | 36 | CC: | avidseeker7, i18n-bugs, mfabian, petersen, shawn.p.huang, tfujiwar |
| Target Milestone: | --- | ||
| Target Release: | --- | ||
| Hardware: | Unspecified | ||
| OS: | Unspecified | ||
| Whiteboard: | |||
| Fixed In Version: | ibus-1.5.27-9.fc38 | Doc Type: | If docs needed, set a value |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2023-01-12 10:15:34 UTC | Type: | Bug |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
For ibus-typing-booster I fixed it like this (was surprisingly easy): https://github.com/mike-fabian/ibus-typing-booster/issues/379 https://github.com/mike-fabian/ibus-typing-booster/commit/c788401c794843a6b99c91a51f9cb67b32ffc86e I just had to allow other keys than Multi_key and dead keys to start a sequence and I had to add 0x01000000 to when calculating the key value of keysyms of the type <UXXXX>, that was all. I hope it is equally easy in Gtk and ibus ... The problem in ibus seems to be something different, sequences not starting with Multi_key and not with dead keys do work. It is not the length of the sequence either, even sequences of length 1 work **if** they are written in ~/.XCompose So adding a ~/.XCompose like this makes typing the `b` key with the Arabic keyboard layout do the right thing: $ cat ~/.XCompose include "/%L" <UFEFB> : "لا" # ARABIC LIGATURE LAM WITH ALEF <U263A> : "single char compose sequence worked" $ But that sequence is already defined in the system wide compose file: $ grep '^<UFEFB>' /usr/share/X11/locale/en_US.UTF-8/Compose <UFEFB> : "لا" # ARABIC LIGATURE LAM WITH ALEF So it should work without having to add a ~/.XCompose file, but it doesn't. The same trick works for Gtk3, I was confused for a moment because I happened to have a ~/.config/gtk-3.0/Compose file and then Gtk3 reads **only** that, see: https://docs.gtk.org/gtk3/class.IMContextSimple.html But after I deleted ~/.config/gtk3/Compose, the sequences $ cat ~/.XCompose include "/%L" <UFEFB> : "لا" # ARABIC LIGATURE LAM WITH ALEF <U263A> : "single char compose sequence worked" $ worked in env GTK_IM_MODULE=gtk-im-context-simple gedit as well. But it **still** does **not** work in Gtk4, although I made sure that ~/.config/gtk-4.0/Compose did not exist and confirmed that other compose sequences like <Multi_key> <m> <o> <u> <s> <e> : "🐭" # U+1F42D MOUSE FACE defined in ~/.XCompose worked with env GTK_IM_MODULE=gtk-im-context-simple gnome-text-editor and env GTK_IM_MODULE=gtk-im-context-simple gtk4-demo the compose sequences <UFEFB> : "لا" # ARABIC LIGATURE LAM WITH ALEF <U263A> : "single char compose sequence worked" still did not work with Gtk4. I think the issue is fixed in rawhide and I back port the fixes to ibus-1.5.27-11.1.fc37 in the copr repo. https://copr.fedorainfracloud.org/coprs/fujiwara/ibus/ Could you please test it? I tested https://download.copr.fedorainfracloud.org/results/fujiwara/ibus/fedora-rawhide-x86_64/05219560-ibus/ibus-1.5.27-11.1.fc38.x86_64.rpm in a Fedora rawhide VM and it fixes the problem. I also tested https://download.copr.fedorainfracloud.org/results/fujiwara/ibus/fedora-37-x86_64/05219560-ibus/ibus-1.5.27-11.1.fc37.x86_64.rpm on Fedora 37, it fixes the problem there as well. Thank you for your quick tests. Fedora rawhide has this fix but Fedora 37 does not and ibus copr 37 is available. |
The following compose sequences do not work in ibus: $ grep -i arabic.*ligature /usr/share/X11/locale/en_US.UTF-8/Compose # Arabic Lam-Alef ligatures <UFEFB> : "لا" # ARABIC LIGATURE LAM WITH ALEF <UFEF7> : "لأ" # ARABIC LIGATURE LAM WITH ALEF WITH HAMZA ABOVE <UFEF9> : "لإ" # ARABIC LIGATURE LAM WITH ALEF WITH HAMZA BELOW <UFEF5> : "لآ" # ARABIC LIGATURE LAM WITH ALEF WITH MADDA ABOVE They are needed because the Arabic keyboard layout outputs UFEFB on some key: $ grep -i fefb /usr/share/X11/xkb/symbols/ara key <AB05> { [ UFEFB, UFEF5, NoSymbol, NoSymbol ]}; // ﻻ ﻵ key <AB05> { [ UFEFB, UFEF5, U06AB, U06AD ]}; // ﻻ ﻵ ګ ڭ but the UFEFB characters is not what is desired, what one really wants is U+0644 U+0627. But xkb keyboard layouts can only output one keysym when typing a key, not two. So compose was used as a hack to work around this limitation of xkb: The keyboard produces UFEFB and then the compose support replaces this with U+0644 U+0627. This works when the compose support in Xorg is used but not when the compose support in ibus is used. How to reproduce: 1) First show that it works when using the Xorg compose support: Start xterm like this (to disable ibus and use the Xorg compose support): env XMODIFIERS=@im=none xterm & Then in the xterm, type $ echo -n b | iconv -f utf8 -t utf16le | od -x 0000000 0062 0000002 and we see that the b produces U+0062, which is correct. Switch to the Arabic keyboard setxkbmap ara type “arrow up” to get the echo -n b | iconv -f utf8 -t utf16le | od -x line back, go back to the b with “arrow left”, type b and now one gets: echo -n لا | iconv -f utf8 -t utf16le | od -x 0000000 0644 0627 0000004 I.e. even though the keyboard surely outputs only U+FEFB, the Compose support of Xorg transforms this into U+0644 U+0627 2) Now repeat the same test using the compose support in ibus: Start xterm like this to use the ibus compose support: env XMODIFIERS=@im=ibus xterm & Then in the xterm, type $ echo -n b | iconv -f utf8 -t utf16le | od -x 0000000 0062 0000002 and we see that the b produces U+0062, which is correct. Switch to the Arabic keyboard setxkbmap ara type “arrow up” to get the echo -n b | iconv -f utf8 -t utf16le | od -x line back, go back to the b with “arrow left”, type b and now one gets: echo -n ﻻ | iconv -f utf8 -t utf16le | od -x 0000000 fefb 0000002