Restore multi-editing option on GUI #229

Job	Run time
build_windows_cmake (Release, x64, amd64)	5m 0s
build_windows_msys2 (Release, x86_64)	5m 21s
build_windows (Release, x64)	4m 13s
build_windows_msys2 (Release, i686)	4m 36s
build_windows (Release, Win32)	4m 19s
build_windows_msys2 (Debug, x86_64)	4m 42s
build_windows (Release, ARM64)	3m 51s
build_windows_msys2 (Debug, i686)	3m 51s
build_windows (Debug, x64)	6m 1s
build_windows (Debug, Win32)	4m 16s
build_windows (Debug, ARM64)	2m 51s
	49m 1s

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