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Qt usually request InputMethod::hide() upon unfocus, but InputMethod::show() is actually never called if focus transfer is done by keyboard, which leads to a permanent disabled input method state. It can be easily reproduced with a window with two text field, e.g. QFileDialog, by pressing tab to switch the focused widget. The semantics of hide/show should not deactivate the input method. Instead, it should simply hide/show the input panel. Also it should not be a hard request for input method to permanently hide the window. When input method asked to show it again, the input panel window should be shown.
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