Juergen Spitzmueller 99aefa5fd2 Implement tri-state in GuiSetBorder
A new UNDECIDED state is used if multiple cells with differing border
settings are selected.

This prevents additional borders to be set without being asked.

Fixes: #10010
2018-07-24 13:49:27 +02:00
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2018-07-24 13:49:27 +02:00
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