Make auto-indent work on multi-editing #46

Job	Run time
build_windows (Release, x64)	3m 26s
build_windows_cmake (Release, x64, amd64)	3m 32s
build_windows (Release, Win32)	3m 36s
build_windows_msys2 (Release, x86_64)	5m 45s
build_windows (Release, ARM64)	4m 18s
build_windows_msys2 (Release, i686)	5m 58s
build_windows_msys2 (Debug, x86_64)	5m 16s
build_windows (Debug, x64)	6m 32s
build_windows_msys2 (Debug, i686)	5m 10s
build_windows (Debug, Win32)	3m 54s
build_windows (Debug, ARM64)	4m 18s
	51m 45s

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