Mario Sanchez Prada 779b1ae8e5 slider: Emit a 'drag-begin' signal when starting to drag
We are already emitting a 'drag-end' signal when no more dragging
is happening, so it makes sense to emit a 'drag-begin' too when
starting, so that apps interested in implementing different logic
between those two events can easily do it without needing to deal
with the underlying 'button-press-event' signal for the actor.

https://bugzilla.gnome.org/show_bug.cgi?id=761208
2016-01-27 22:35:11 +00:00
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