qtile / qtile / 25474764651

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wayland: dispatch pointer enter/leave/motion to bar widgets

Like x11, bar widgets need mouse_enter / mouse_leave to drive things
like tooltips. On x11 the EnterNotify / LeaveNotify / MotionNotify path
already feeds Bar.process_pointer_* on each bar window. On wayland
nothing was firing those, so hover callbacks (e.g. qtile-extras'
TooltipMixin) never ran.

The qw_view returned by qw_server_view_at is already enough — when it
points to an Internal view, fire pointer_internal_event_cb after the
existing focus update. Track the previous wid in qw_cursor so each
transition produces one ENTER / LEAVE / MOTION event. The python side
just forwards into win.process_pointer_*, which is the same dispatch
x11 uses.

No extra hit-testing on the hot path: the scene graph lookup was
already running for ordinary pointer focus.

15 of 16 new or added lines in 1 file covered. (93.75%)

17106 of 20694 relevant lines covered (82.66%)

4.5 hits per line