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ffb8904913
Some terminals don't report which buttons are involved in some mouse events. For example, the urxvt protocol (http://www.huge-man-linux.net/man7/urxvt.html section "Mouse reporting") does not report which button has been released. In this case libtermkey reports button 0 (http://www.leonerd.org.uk/code/libtermkey/doc/termkey_interpret_mouse.3.html) Up to now, forward_mouse_event did not handle button==0. On press events there is not much we can do, and we keep the current behavior which is dropping the event. But on drag-and-release events we can compensate by remembering the last button pressed. fixes #3182 for urxvt fixes #5400