Circumvent problems of Qt stylesheet in kvantum theme #64
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This simple change is a workaround for 3 bugs of Qt stylesheet, revealed by kvantum theme: (1) selected menu arrows weren't shown; (2) taskbar right-click (sub)menus didn't have enough width; and (3) selected menu check-boxes could have a weird border, sometimes when checked, sometimes when unchecked.
Those problems don't show up in most themes because they include the workarounds automatically.