fix tree node labels rendering their "button" backgrounds #309

Job	Run time
Check the access tokens used for publishing	1s
Generate Version-Specific Network Keys	54s
Build for Linux	2m 15s
Build for Windows	6m 35s
Build for MacOS	2m 2s
Publish GitHub Release	0s
Debug Build Artifacts	0s
Publish to Forum	0s
	11m 47s

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