Fix bugs around mass selection/single selection/drag and drop #145

Job	Run time
🔍 Engine Files Changed / Changed Files	6s
🔍 GUI Files Changed / Changed Files	4s
📦 Package / Build Backend (windows, amd64)	8m 23s
📦 Package / Build Backend (linux, amd64)	6m 0s
📦 Package / GUI build (linux, amd64)	1m 12s
📦 Package / GUI build (windows, amd64)	1m 39s
📦 Package (Optional) / Build Backend (macos, amd64)	45m 13s
📦 Package (Optional) / GUI build (macos, amd64)	16m 46s
📦 Package / Package New IDE (linux, amd64)	5m 44s
📦 Package / Package New IDE (windows, amd64)	12m 9s
IDE Required Checks	1s
📦 Package (Optional) / Package New IDE (macos, amd64)	20m 15s
	1h 57m 32s

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