Fix wrong preedit cursor position in 2.4.x built on Qt5

[Yokota K.]

Committed on 2.4.x and master. Thanks!

Koji

> 2024/08/20 18:51、Yokota K. <yokota6 at gmail.com>のメール:
> 
> Pavel,
> 
> Oops, I’ll post it to the master as well. I missed to mention about it as I was thinking of the possibility to overwrite it with another version before 2.5 comes (hopefully), which introduces modern OnTheSpot style instead of the current OverTheSpot one.
> 
> Koji
> 
>> 2024/08/20 16:48、Pavel Sanda <sanda at lyx.org>のメール:
>> 
>> On Tue, Aug 20, 2024 at 02:02:01PM +0900, Yokota K. wrote:
>>> LyX-2.4.1 built on Qt5 seems to have wrong cursor position while editing preedit strings using the input method. Since this is annoying for input method users, may I apply the attached patch to the 2.4.x code?
>>> 
>>> The preedit cursor position in the completing mode (choosing right chars from candidates by parts) reported by Qt5 points to the *end* of the selected part, while Qt6 points to the *start* of it.
>>> 
>>> These different behaviors were not documented, so I missed to reflect it to the Qt5 case in fixing #13054.
>> 
>> Looks reasonable and confined to predit text routines. But why it's only for 2.4.x and not master?
>> 
>> Pavel
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