Seems annoying. Not sure if this is intentional. To reproduce: * Add two vertices * draw an edge between them * click on the edge * press enter such that the label editor turns blue * type some label e.g. "abc" * press ctrl+A. You'll see the GUI flashes for a moment * press ctrl+A again. Now everything is selected Maybe the last step (everything become selected) is intentional if the user want to select everything, but the GUI flash looks like a bug to me.