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clutter-stage: Don't emit "after-paint" when picking [performance]

Daniel van Vugt requested to merge vanvugt/mutter:no-after-paint-when-picking into master

The "after-paint" signal should only be emitted on real stage repaints and not fake stage repaints used in picking. The latter might occur at a much higher and inconsistent rate and is not what apps/toolkits listening for _NET_WM_FRAME_DRAWN care about.

Without this change, apps will receive an extra _NET_WM_FRAME_DRAWN event for every call to _clutter_stage_do_pick_on_view. So GTK apps for example would get GtkTickCallback faster than the display's refresh rate.

Edited by Jeff Fortin

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