Bottom icon on launcher tilts when it maybe shouldn't if icons fill launcher nearly exactly

Test Case:
  1, Install unity 3.8.14
  2, open enough applications to fill your launcher with icons, but not enough to "overflow" the launcher if you mouse over the launcher
  3, check that the bottom icon is not folded/folding when you are not mousing over the launcher or using keynav

Binary package hint: unity

If the launcher is almost exactly filled with icons (that is, the number of icons is enough to fill the launcher plus a tiny bit) then the bottom icon tilts so as to fit in the launcher, but it only tilts a tiny bit. Then, when I mouseover the launcher, that icon untilts, just a tiny bit. It looks quite strange, because the tiny amount of tilt is not really enough to see that the icon *is* tilted, and so it just looks like the bottom icon just oddly changes shape on mouseover.

See attached video for a much better visual explanation.

Suggested fixes:
 * don't tilt the bottom icon unless it'll tilt enough to actually see that it's tilted (as you can see in the video, when untilted, the icon fits in the launcher)
 * tilt the bottom icon more than would technically be required in order that it looks tilted

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: unity 3.6.0-0ubuntu2
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Date: Fri Mar 4 09:45:13 2011
DistUpgraded: Log time: 2011-01-18 17:25:59.814253
DistroCodename: natty
DistroVariant: ubuntu
GraphicsCard:
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Renderer: Unknown
SourcePackage: unity
UpgradeStatus: Upgraded to natty on 2011-01-18 (44 days ago)
dmi.bios.date: 12/26/2008
dmi.bios.vendor: Dell Inc.
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