Improve Python smart indent in case of string #641

Job	Run time
before_build	47s
build_windows_cmake (Release, x64, amd64)	4m 48s
build_windows_msys2 (Release, x86_64)	5m 54s
build_windows (Release, x64)	4m 1s
build_windows_msys2 (Release, i686)	5m 9s
build_windows (Release, Win32)	3m 19s
build_windows_msys2 (Debug, x86_64)	4m 47s
build_windows (Release, ARM64)	4m 32s
build_windows_msys2 (Debug, i686)	4m 15s
build_windows (Debug, x64)	5m 46s
build_windows (Debug, Win32)	4m 15s
build_windows (Debug, ARM64)	3m 18s
	50m 51s

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