splitter: When double-clicking splitter, it now snaps closed if AutoSnap is set.
splitter: When double-clicking splitter, it now snaps closed if AutoSnap is set.

wkitty42/fpGUI,wkitty42/fpGUI,wkitty42/fpGUI,wkitty42/fpGUI,wkitty42/fpGUI,wkitty42/fpGUI