… gimp_prop_widget_set_factor() to libgimpwidgets.
Now that GimpSpinScale is in libgimpwidgets, it's time to move the
associated prop too, to make it a prop widget with such a widget easily
creatable by plug-ins.
While doing so, I update both these functions logic, binding properties
together with the g_object_bind_property*() APIs (as we do already in
some other recent prop functions) rather than connecting to signals
ourselves. It makes for much simpler code.
and remove a gazillion gtk_widget_show() all over the place, some
places need a gtk_widget_hide() now, and I'm pretty sure I broke at
least one thing in all those files...
... and rename "clockwise" to "clockwise-delta"
Add a boolean "clockwise-angles" property to GimpDial, which, when
set, causes the dial legs' angles to be measured clockwise, rather
than counter-clockwise. The property is FALSE by default.
Rename the "clockwise" property, which controls the direction of
the measured delta between the two angles, to "clockwise-delta", to
avoid confusion, and adapt the rest of the code.