When editing text using input method, the cursor position (rectangle) should be set correctly using qt5 input method API to make it possible for input method to show a overlay window there. Musescore is not setting it correctly now currently.
I'm not sure what do you mean by IME. But if it is for "Input Method Engine", which is what I usually mean by IME, I am not directly using IME. IME's are plugins for input method frameworks (IMF's) and IMF's are talking to qt applications.
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To clarify, you are entering chinese text via IME right ?
via Input Method, which talks to qt5 application uses the input method platform plugin.
I'm not sure what do you mean by IME. But if it is for "Input Method Engine", which is what I usually mean by IME, I am not directly using IME. IME's are plugins for input method frameworks (IMF's) and IMF's are talking to qt applications.