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

[Yokota K.]

Dear developers,

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.

Best regards,

Koji Yokota

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