tui/input.c: add support for mouse release events in urxvt (#8309)

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

0 files changed, 0 insertions, 0 deletions