Adjust availableScreenRect of Coronas for stacked panels in edit mode

Niccolò Venerandirequested to merge
work/niccolove/505417 into master
  • Adjust availableScreenRect of Coronas for stacked panels in edit mode

When entering edit mode, panels stack on top of each other instead of overlapping. This might cause them to get inside the available screen rect, where they might cover other content. Instead, this commits makes availableScreenRect update based on the edit mode status and makes the panel setting dialog reposition based on it.

BUG:505417

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