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Bug
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    Resolution: Cannot Reproduce
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P1: Critical
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    None
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    5.12.6, 5.14.0
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    None
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    Qt 5.12.6: MSVC 2015 64bit, QtQuick 2.12
Qt 5.14.0: MSVC 2017 64bit, QtQuick 2.14
Windows 10 pro
Version 10.0.18362 Build 18362
 
Mouse clicks work only after a few hundred milliseconds have passed after a keyboard input (key does not seem to matter). Minimum working example attached, run with qmlscene to reproduce:
- Click in window. Color changes.
 - Press key before clicking. Color does not change. Wait a little, clicks work again.
 
On Ubuntu with 5.12.6, the same MWE workes fine, so it appears to be a platform-specific issue. Not tested on MacOS.