Fix DELETE key not working in multi-editing #55

Job	Run time
build_windows_cmake (Release, x64, amd64)	4m 34s
build_windows_msys2 (Release, x86_64)	6m 2s
build_windows (Release, x64)	3m 25s
build_windows_msys2 (Release, i686)	5m 20s
build_windows (Release, Win32)	3m 52s
build_windows (Release, ARM64)	4m 47s
build_windows_msys2 (Debug, x86_64)	5m 34s
build_windows (Debug, x64)	6m 34s
build_windows_msys2 (Debug, i686)	5m 11s
build_windows (Debug, Win32)	4m 55s
build_windows (Debug, ARM64)	3m 34s
	53m 48s

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