Only make thickest visible panel reserve space for each edge

Niccolò Venerandirequested to merge
work/niccolove/477939 into master
  • Only make thickest visible panel reserve space for each edge

All other panels will ignore exclusive spaces on edges; this allows to have multiple panels on the same screen edge, all touching the screen edge instead of stacking. This was the status quo previous to the introduction of layershells; it's not perfect (as it allows for panels to intersect without a clear way to decide which one should be shown above) but it's an improvement to the status quo.

BUG:477939 BUG:500668

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