SUMMARY On Spanish keyboards (among others, I guess), you type accented characters such as "à" or "ö" by hitting the key for the accent ("`" or "¨" in the examples above) followed by the letter. This works in all applications (that I've ever tried) in OpenSUSE, and usually it works in Kate. Starting recently, it sometimes randomly happens that this suddenly stops working in Kate. When this happens, hitting the accent key followed by a letter results in just the plain unaccented letter. For example, "`"+"e" results in "e" instead of "è". This stops working in Kate only (or at least I've tested several other applications when it stops working in Kate and they keep working). Restarting Kate usually "fixes" the issue. Operating System: openSUSE Tumbleweed 20210612 KDE Plasma Version: 5.22.0 KDE Frameworks Version: 5.82.0 Qt Version: 5.15.2 Kernel Version: 5.12.9-1-default (64-bit) Graphics Platform: X11 Processors: 8 × Intel® Core™ i7-1065G7 CPU @ 1.30GHz Memory: 7.3 GiB of RAM Graphics Processor: Mesa DRI Intel® Iris® Plus Graphics
Now this has started affecting not only Kate but also other applications (konsole, Telegram Desktop) though NOT all (e.g. Chrome and Thunderbird still work). AND restarting the affected application no longer fix the issue. I hope reboot does or this is a disaster. If I can't type properly, my computer is a brick to me.
Looks like the Qt key composition is broken for you. That would explain why this fails for Qt applications (Telegram Desktop is Qt based, too). I would propose to report this upstream to openSUSE. This seems to be no KDE/Kate specific issue.
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https://bugzilla.suse.com/show_bug.cgi?id=1187513
Please follow then up on the bug you linked. I don't see how we could fix this on our layer of the stack, e.g. KTextEditor or higher. This is not a bug in our code.