Fix replace field focus losing when Notepad++ is switched back #47

Job	Run time
before_build	28s
build_windows_cmake (Release, x64, amd64)	4m 19s
build_windows_msys2 (Release, x86_64)	5m 17s
build_windows (Release, x64)	3m 50s
build_windows_msys2 (Release, i686)	4m 45s
build_windows (Release, Win32)	3m 34s
build_windows_msys2 (Debug, x86_64)	4m 35s
build_windows (Release, ARM64)	4m 13s
build_windows_msys2 (Debug, i686)	4m 23s
build_windows (Debug, x64)	5m 32s
build_windows (Debug, Win32)	4m 46s
build_windows (Debug, ARM64)	3m 58s
	49m 40s

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