Misplaced IME window in 2.4.0

[Scott Kostyshak]

On Thu, Mar 21, 2024 at 11:31:35AM GMT, Allan Chain wrote:
> Hello, LyX developers!
> 
> I'm trying out LyX 2.4.0-rc3 (qt6) on KDE6+Wayland, and I'm using fcitx5 to
> input CJK characters. I found that the candidate window of the input method
> is always on the top left corner of the window, regardless of the cursor
> position. I think it's a regression since 2.3.7 does not have such problem.
> 
> After looking into the source code, I found that the position hint
> (Qt::ImCursorRectangle) is only updated when preedit is enabled. Although
> enabling preedit eases the problem, the experience is still not very smooth.
> Specifically, when the position of the cursor is changed, for example by
> clicking, the position hint for the candidate window is not immediately
> updated, and thus the candidate window pops up in a wrong position. Only
> after some keystrokes triggering preedit event that the position of the
> candidate window is correctly updated.
> 
> I'm not familiar with LyX codebase, but in my opinion, a better solution is
> to update the position hint for the input method every time the cursor
> position changes.
> 
> I'm happy to provide more information to help fixing this.

Hi Allan,

Thanks a lot for reaching out to the list! I don't know anything about
this code, but I did want to bump this email thread so maybe someone
more knowledgeable has an idea.

One question though: are you sure it's a regression in the LyX code?
Could it be differences in the Qt library that the binaries use that is
the real reason, or are the Qt versions the same?

Scott
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