[Input Method] First keystroke with input method after in focus closes the input method box

[LouieTian0209]

Version: Linux gtk2
Input method framework: fcitx
Input method: fcitx-googlepinyin

Steps to reproduce:

1. Switch to Google Pinyin for input method
2. Bring another window to focus
3. Bring CudaText back to focus
4. Press a letter key on the keyboard

Expected behavior: The result box for input method should show up and stay up with pressed key input

Current behavior: The result box for input method gets closed automatically

Demo video:

input_method_focus.mp4

[Alexey-T]

@rasberryrabbit Can you look at this, pls?
maybe we need some more Ime* methods called on app deactivate/activate?

[rasberryrabbit]

Returning to old focused window, some invalid behavier occured.
It may Lazarus keyboard event may doesn't work with it.
I cannot resolve it currently.

[Alexey-T]

fixed.