Fix bugs around mass selection/single selection/drag and drop #187

Job	Run time
🔍 Engine Files Changed / Changed Files	6s
🔍 GUI Files Changed / Changed Files	5s
🔍 IDE Files Changed / Changed Files	9s
📦 Package (Optional) / GUI build (macos, amd64)	13m 52s
📦 Package (Optional) / Build Backend (macos, amd64)	27m 49s
📦 Package / GUI build (linux, amd64)	1m 17s
📦 Package / Build Backend (windows, amd64)	13m 18s
📦 Package / GUI build (windows, amd64)	2m 40s
📦 Package / Build Backend (linux, amd64)	5m 5s
📦 Package / Package New IDE (linux, amd64)	6m 29s
📦 Package / Package New IDE (windows, amd64)	12m 0s
📦 Package (Optional) / Package New IDE (macos, amd64)	33m 20s
IDE Required Checks	1s
	1h 56m 11s

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