https://bugs.kde.org/show_bug.cgi?id=445846
Bug ID: 445846
Summary: "Bi-directional text rendering" should be renamed to
something like "Support for complex scripts"
Product: konsole
Version: master
Platform: Other
OS: Linux
Status: REPORTED
Severity: minor
Priority: NOR
Component: general
Assignee: konsole-de...@kde.org
Reporter: ninj...@gmail.com
Target Milestone: ---
SUMMARY
At https://invent.kde.org/utilities/konsole/-/merge_requests/524 @tcanabrava
commented:
«When we are in bidirectional text mode, for some reason, konsole treated a
sequence of braile characters as "something that could be grouped into a single
string", passed directly to the painter->drawText, producing strange results.»
>From https://bugs.kde.org/show_bug.cgi?id=401094#c11
« Possible solutions:
* Add an option for enabling the feature. I'm against this. It will be broken
eventually, because many developers won't test yet another rendering mode.
Also: hack.
* Rename "Bi-directional text rendering" option to something like "Support
for complex scripts" and enable special > rendering for complex scripts like
Malayalam when it is enabled. RTL scripts already have the same problems, so >
users wouldn't be suprised. This solution has the same issues as previous one,
but it's already there.»
While the behavior changed as per option 2 above, the rename never happened.
ADDITIONAL INFORMATION
Some history:
- Per https://bugs.kde.org/show_bug.cgi?id=393644, commit
https://github.com/KDE/konsole/commit/a565bc97337a3bfc3a027f46aa2dec3e9a6f8618
, which clips characters to its cell, broke Arabic and other scripts that need
to render whole words (in Arabic, there are different glyphs for initial,
medial, final and isolated positions).
- Commit bdd98f8561ec92098794e411517f630c87a1dc02 attempted a fix by grouping
characters with Right or ArabicLetter directionality.
- Bug https://bugs.kde.org/show_bug.cgi?id=401094 is for Malayalam. As it
happens, many Brahmic scripts, while typically being Left-To-Right, also need
to render whole runs of text as a unit (a syllable may be represented by a
glyph for a consonant cluster with dependant vowels in its vecinity).
- Commit 94ff722fc0e68987bd743663bc63ef99ff4e0706 was a first attempt to fix
Malayalam.
- Commit 8ad28a12574cadc7a41e152ec683380d7743c2a8 groups characters by script
when bidi is enabled and the character is not double width.
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