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applets: fix plasmashell freeze on very wide panels

Christoph Wolk requested to merge cwo/powerdevil:applets_fix_plasma_layout_freeze into master

When the fullRepresentation is used directly in a very wide panel, especially if other widgets are also present, Plasma may freeze as it gets stuck on switching between the representations - the compactRepresentation is large enough that it wants to switch, but the fullRepresentation ends up too small and switches back, forever.

Unsetting Layout minimum sizes (and preferredHeight) in those cases prevents the issue from happening. This yields a square size which isn't necessarily optimal for battery monitor with possibly lots of entries, but better than a total freeze and is a reasonable and predictable default size for in-panel use.

See also kdeplasma-addons!851 (merged) and a bunch of other recent MRs

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