fix erroneous mouse motion when alt-tabbing in CS2 #2555

Job	Run time
Create test plan	6s
level1 / Haiku	1m 57s
level2 / RISC OS	1m 22s
level2 / GDK (MSVC, x64)	2m 50s
level2 / Sony PlayStation 2	4m 56s
level2 / Windows (MSVC, ARM)	3m 22s
level2 / MacOS (Framework) (x64)	5m 40s
level2 / Android (CMake, lean)	2m 59s
level2 / Windows (msys2, clang64)	5m 51s
level2 / Windows (msys2, ucrt64)	8m 9s
level2 / Ubuntu 22.04	4m 17s
level2 / Windows (MSVC, clang-cl x86)	4m 5s
level2 / Ubuntu 20.04	4m 8s
level2 / tvOS (CMake & xcode)	1m 38s
level2 / Windows (MSVC, x86)	4m 2s
level2 / Windows (MSVC, x64)	5m 20s
level2 / LoongArch64	2m 41s
level2 / Nintendo 3DS	1m 58s
level2 / PowerPC64	1m 49s
level2 / MacOS (GNU prefix)	2m 58s
level2 / Windows (msys2, mingw64)	7m 46s
level2 / Windows (MSVC, ARM64)	3m 22s
level2 / Steam Linux Runtime (Sniper)	2m 55s
level2 / Windows (msys2, mingw32)	8m 3s
level2 / Emscripten	9m 4s
level2 / Android (Gradle)	2m 26s
level2 / MacOS (Framework) (arm64)	2m 29s
level2 / Sony PlayStation Vita (GLES w/ pib)	3m 9s
level2 / PowerPC	1m 47s
level2 / Android (Android.mk)	1m 19s
level2 / Sony PlayStation Portable	3m 52s
level2 / Ubuntu 20.04 (Intel oneAPI)	6m 29s
level2 / FreeBSD	2m 53s
level2 / Sony PlayStation Vita (GLES w/ PVR_PSP2)	3m 27s
level2 / iOS (CMake & xcode)	1m 50s
level2 / NetBSD	2m 35s
level2 / Windows (msys2, clang32)	6m 41s
level2 / Ubuntu 20.04 (Intel Compiler)	4m 40s
level2 / Windows (MSVC, clang-cl x64)	5m 16s
level2 / Android (CMake)	3m 3s
	2h 33m 14s

Provide feedback