[Ohrrpgce] SVN: teeemcee/9387 Two tiny fixes to the slice editor: Shift-Down on the last slice moved s

[subversion at HamsterRepublic.com]

teeemcee
2017-09-17 08:00:49 -0700 (Sun, 17 Sep 2017)
230
Two tiny fixes to the slice editor: Shift-Down on the last slice moved selection to "Previous Menu",
and Panel slices weren't given the same exception as Grid slices were due to their custom screenpos recalc.
Some helpful comments
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U   wip/sliceedit.bas
U   wip/slices.bi