In various mixins that repaint the gadget in response to events, supply (or (pane-viewport-region gadget) (sheet-region gadget))) rather than +everywhere+ to improve performance for large sheets embedded in a scroller-pane.
In various mixins that repaint the gadget in response to events, supply
(or (pane-viewport-region gadget) (sheet-region gadget))) rather than
+everywhere+ to improve performance for large sheets embedded in a
scroller-pane.

informatimago/mcclim,quek/mcclim,quek/mcclim,informatimago/mcclim