st/adjustment: Ensure changed signal emission is compressed
The docs say that st_adjustment_set_values()
emits the changed
signal only once but it's actually emitted for each changed property,
this uses the dispatch_properties_changed
vfunc to emit the changed
signal only per call to st_adjustment_set_values()
. As a positive
side effect this also makes it possible to use g_object_freeze/thaw_notify
to compress the changed
signal emission when using the setters for
properties.
This also fixes the wrong emission of the changed
signal in
st_adjustment_set_values()
when only the value
property is changed.
Side note: the code is heavily inspired by GtkAdjustment