fix: x11 preview display when window effects are set to optimal perfo… #952
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…rmance.
WM_HELPER->hasComposite()在X下一直会返回true, 已经无法判定当前是否有合成和特效。专业版已经改用WM_HELPER->hasBlurWindow()来代替。
当设置窗口显示为最佳性能的时候,无透明通道,无法获取窗口截图,hasBlurWindow()返回为false,但此时kwin还有预览窗口的功能。
Log: as title
pms: BUG-292179