Bug 2131516
| Summary: | Sinhala letters shake, wobble and momentarily disappear and reappear when typing, sometimes with wrong cursor positions. | ||
|---|---|---|---|
| Product: | [Fedora] Fedora | Reporter: | Lohan G <lohang> |
| Component: | pango | Assignee: | Mike FABIAN <mfabian> |
| Status: | NEW --- | QA Contact: | Fedora Extras Quality Assurance <extras-qa> |
| Severity: | medium | Docs Contact: | |
| Priority: | unspecified | ||
| Version: | 44 | CC: | caillon+fedoraproject, fonts-bugs, gnome-sig, i18n-bugs, lohang, mclasen, mfabian, pnemade, pwu, rhughes, rstrode, sandmann, shawn.p.huang, tagoh |
| Target Milestone: | --- | Keywords: | Reopened |
| Target Release: | --- | Flags: | pnemade:
mirror+
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| Hardware: | Unspecified | ||
| OS: | Unspecified | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | If docs needed, set a value | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2026-06-08 15:39:33 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: | |||
| Attachments: | |||
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Description
Lohan G
2022-10-02 04:12:28 UTC
Created attachment 1915512 [details]
Two cursors?
The lines that appear on both sides of the letter, possibly a wrong cursor position or two cursors?
Created attachment 1915848 [details]
Something close to the expected result : ibus-typing-booster + LibreOffice
Shaking/wobbling doesn't occur with ibus-typing-booster; characters don't disappear and reappear. This is the closest to the expected outcome I could get on Fedora 37.
However, the cursor position issue (or two simultaneous cursors) can still be seen when typing in gedit.
I believe this two cursor thing is a pango problem. Created attachment 1915902 [details]
Small test file to show the double cursor problem.
The test file contains:
ම U+0DB8 SINHALA LETTER MAYANNA
ො U+0DDC SINHALA VOWEL SIGN KOMBUVA HAA AELA-PILLA
මො
If this is displayed in gedit and the cursor it positioned after the final character in the 3rd line, one sees a double cursor.
Created attachment 1915903 [details]
Video showing the problem using the test file sinhala-double-cursor-problem-test-text.txt in gedit
gedit sinhala-double-cursor-problem-test-text.txt
Then move the cursor to the end of the text and step backwards.
When the cursor is at the end of the text, double cursor is shown.
Which versions of pango and harfbuzz do you have installed? I currently have mfabian@fedora:~ $ cat /etc/fedora-release Fedora release 37 (Thirty Seven) mfabian@fedora:~ $ rpm -q pango harfbuzz pango-1.50.10-1.fc37.x86_64 harfbuzz-5.2.0-1.fc37.x86_64 mfabian@fedora:~ $ and I cannot reproduce the problem with the double cursor anymore. I can still reproduce it on Fedora 36 with these versions of pango and harfbuzz: $ rpm -q pango harfbuzz pango-1.50.9-1.fc36.x86_64 pango-1.50.9-1.fc36.i686 harfbuzz-4.0.0-2.fc36.x86_64 harfbuzz-4.0.0-2.fc36.i686 (In reply to Mike FABIAN from comment #6) > Which versions of pango and harfbuzz do you have installed? > > I currently have > > mfabian@fedora:~ > $ cat /etc/fedora-release > Fedora release 37 (Thirty Seven) > mfabian@fedora:~ > $ rpm -q pango harfbuzz > pango-1.50.10-1.fc37.x86_64 > harfbuzz-5.2.0-1.fc37.x86_64 > mfabian@fedora:~ > $ > > > and I cannot reproduce the problem with the double cursor anymore. > > I can still reproduce it on Fedora 36 with these versions of pango and > harfbuzz: > > $ rpm -q pango harfbuzz > pango-1.50.9-1.fc36.x86_64 > pango-1.50.9-1.fc36.i686 > harfbuzz-4.0.0-2.fc36.x86_64 > harfbuzz-4.0.0-2.fc36.i686 1) My Fedora 37 beta system has: [lohan@fedora ~]$ cat /etc/fedora-release Fedora release 37 (Thirty Seven) [lohan@fedora ~]$ rpm -q pango harfbuzz pango-1.50.11-1.fc37.x86_64 harfbuzz-5.2.0-1.fc37.x86_64 [lohan@fedora ~]$ It continues to show two cursors in gedit (with both ibus-m17n and ibus-typing-booster). 2) My Fedora 36 system has: [lohan@fedora ~]$ cat /etc/fedora-release Fedora release 36 (Thirty Six) [lohan@fedora ~]$ rpm -q pango harfbuzz pango-1.50.9-1.fc36.x86_64 harfbuzz-4.0.0-2.fc36.x86_64 [lohan@fedora ~]$ The double cursor issue continues in F 36 gedit. (with both ibus-m17n and ibus-typing-booster). I think the double cursor issue is improved in Fedora 37 recently, except for the following text: "ලිවීමේ" input by ",sjSfua" "අකුරු" input by "wlqrq" "අයුරු" input by "whqrq" For Fedora 36, after rebuild and install the harfbuzz 5.2.0 and harfbuzz-icu 5.2.0 package, the testing results is the same as Fedora 37. (In reply to Peng Wu from comment #8) > I think the double cursor issue is improved in Fedora 37 recently, except > for the following text: > > "ලිවීමේ" input by ",sjSfua" This one works for me in Fedora 36 and Fedora 37 > "අකුරු" input by "wlqrq" > "අයුරු" input by "whqrq" These two show the double cursor problem for me > For Fedora 36, after rebuild and install the harfbuzz 5.2.0 and harfbuzz-icu > 5.2.0 package, the testing results is the same as Fedora 37. I also tried that now and for me as well the testing results on Fedora 36 are the same as on Fedora 37 with harfbuzz 5.2.0 I tested Peng Wu’s merge request: https://gitlab.gnome.org/GNOME/pango/-/merge_requests/653 This fixes the problem of the double cursor in "අකුරු" input by "wlqrq" "අයුරු" input by "whqrq" I could find no obvious problems when playing with Arabic text in gedit, so I think this will probably not introduce regressions for Arabic. I have just tested Peng Wu’s latest patch in the merge request https://gitlab.gnome.org/GNOME/pango/-/merge_requests/653 i.e. this one: https://gitlab.gnome.org/GNOME/pango/-/merge_requests/653/diffs?commit_id=25e1fc02b69883909a38d60521f52d250c7f8737 and it also fixes the problem of the double cursor in "අකුරු" input by "wlqrq" "අයුරු" input by "whqrq" and I also could not find any obvious problems when playing with Arabic text in gedit. this will likely be fixed only when patch is merged in upstream. Not sure how much time it will take in upstream. Hence moving the target to fix this bug to rawhide. This bug appears to have been reported against 'rawhide' during the Fedora Linux 39 development cycle. Changing version to 39. This message is a reminder that Fedora Linux 39 is nearing its end of life. Fedora will stop maintaining and issuing updates for Fedora Linux 39 on 2024-11-26. It is Fedora's policy to close all bug reports from releases that are no longer maintained. At that time this bug will be closed as EOL if it remains open with a 'version' of '39'. Package Maintainer: If you wish for this bug to remain open because you plan to fix it in a currently maintained version, change the 'version' to a later Fedora Linux version. Note that the version field may be hidden. Click the "Show advanced fields" button if you do not see it. Thank you for reporting this issue and we are sorry that we were not able to fix it before Fedora Linux 39 is end of life. If you would still like to see this bug fixed and are able to reproduce it against a later version of Fedora Linux, you are encouraged to change the 'version' to a later version prior to this bug being closed. This bug appears to have been reported against 'rawhide' during the Fedora Linux 42 development cycle. Changing version to 42. This message is a reminder that Fedora Linux 42 is nearing its end of life. Fedora will stop maintaining and issuing updates for Fedora Linux 42 on 2026-05-13. It is Fedora's policy to close all bug reports from releases that are no longer maintained. At that time this bug will be closed as EOL if it remains open with a 'version' of '42'. Package Maintainer: If you wish for this bug to remain open because you plan to fix it in a currently maintained version, change the 'version' to a later Fedora Linux version. Note that the version field may be hidden. Click the "Show advanced fields" button if you do not see it. Thank you for reporting this issue and we are sorry that we were not able to fix it before Fedora Linux 42 is end of life. If you would still like to see this bug fixed and are able to reproduce it against a later version of Fedora Linux, you are encouraged to change the 'version' to a later version prior to this bug being closed. Fedora Linux 42 entered end-of-life (EOL) status on 2026-05-27. Fedora Linux 42 is no longer maintained, which means that it will not receive any further security or bug fix updates. As a result we are closing this bug. If you can reproduce this bug against a currently maintained version of Fedora Linux please feel free to reopen this bug against that version. Note that the version field may be hidden. Click the "Show advanced fields" button if you do not see the version field. If you are unable to reopen this bug, please file a new report against an active release. Thank you for reporting this bug and we are sorry it could not be fixed. I can still reproduce this on Fedora 44 and rawhide. I need a different test file though. Created attachment 2144983 [details]
Screenshot using the new test file in gedit which shows the problem on Fedora 44 and rawhide
Screenshot showing that the problem still exists in rawhide when displaying the new test file with gedit.
Same on Fedora 44.
Created attachment 2144984 [details]
The new test file test-pango-double-cursor-sinhala-2026-06-10.txt
The new test file test-pango-double-cursor-sinhala-2026-06-10.txt
(In reply to Mike FABIAN from comment #19) > Created attachment 2144983 [details] > Screenshot using the new test file in gedit which shows the problem on > Fedora 44 and rawhide > > Screenshot showing that the problem still exists in rawhide when displaying > the new test file with gedit. > > Same on Fedora 44. AFAIK That blue and black cursors typically happens when Pango can't determine the text direction. |