No, like I said, it is a drawn line created by the QToolBar.addSeparator() method.
That means there is an instruction to "draw a line", not "render an image".
If you want to change that, you will either need to hack calibre to use an image instead of a QToolBar.addSeparator() or you will have to hack and recompile Qt AND calibre to use an image for QToolBar.addSeparator()
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