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i thought that the border of the QSplitter is too thick , so how to set it?
Do you mean http://qt-project.org/doc/qt-5/qsplitter.html#handleWidth-prop ?
As far as I know the splitter has no border by default. Maybe you accidently changed the frameShape (default: NoFrame) or frameShadow (default: Plain)?
Have you checked this link: http://qt-project.org/doc/qt-4.8/stylesheet-examples.html#customizing-qsplitter and this one: http://stackoverflow.com/questions/6832499/qsplitter-show-a-divider-or-a-margin-between-the-two-widgets http://qt-project.org/forums/viewthread/8225
