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See this comment: https://forum.qt.io/topic/60546/qpushbutton-default-windows-style-sheet#3 Stylesheets are a totally different beasts. The default native drawing doesn't use stylesheets. They ...
Answer
#1: Initial revision
by
r~~
·
2022-12-05T04:31:44Z (over 1 year ago)
See this comment: https://forum.qt.io/topic/60546/qpushbutton-default-windows-style-sheet#3 > Stylesheets are a totally different beasts. The default native drawing doesn't use stylesheets. They are a way to override native style dependent painting with HTML-like drawing. Usually if you change one of the basic style elements like border or background Qt disables native painting entirely and falls back to a simple HTML box model. So in short you can't change just one property of a stylesheet and keep original native style painting. There are exceptions to that (e.g. changing text color), but that's what they are - exceptions. In general it's either stylesheets or native painting. Mixing is generally not possible and even if it has the desired result with one theme it might not with another. You're probably using a native drawing style corresponding to your OS for the first button, which has an exception carved out for the `background` property but not for the `border-radius`, so the second button is switching to using the HTML-like style.