[qt5] Avoid infinite repaints upon hovering the folders/tags panels
#720
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We were calling setStyleSheet() unconditionally inside the paint event handlers of the folders/tags panels, which would then trigger a new paint event, causing an infinite repaint recursion. Now, we only call setStylesheet() if the stylesheet of a widget actually needs to be updated. (cherry picked from commit 9cb2616)
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Same commit of PR #719, cherry picked for the
qt5branch.