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    Bug 
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    Resolution: Done
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    P2: Important 
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    5.15.0
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        0bf120f5fd197cd215cd9520a494b162887d1ec4 (qt/qtbase/dev) 7218665699e31ac8eebab17afd684d1a56d12ac3 (qt/qtbase/5.15)
With 5.15.0, application 's style settings seem to be ignored and therefore it's not applied.
Please refer to the attached sample. It is working fine till 5.14.2