Misplaced IME window in 2.4.0

[Allan Chain]

Hi Scott,

I think its a regression in LyX code. Although the Qt version is 
different, the code in 2.3.x branch correctly returns the position of 
the caret in `GuiWorkArea::inputMethodQuery`. However in 2.4.x branch, 
it returns `im_cursor_rect_` which is only updated when preedit is enabled.

Allan Chain


On 2024-04-06 11:01 AM, lyx-devel-request at lists.lyx.org wrote:
> 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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