Problem: exists(':keepalt') return 0 #720

Job	Run time
macos (tiny, macos-12)	1m 6s
windows (HUGE, msvc, no, no, x64, stable)	8m 44s
macos (tiny, macos-14)	46s
linux (tiny, clang, native)	2m 9s
windows (HUGE, mingw, yes, yes, x86, stable, yes)	12m 5s
macos (normal, macos-12)	6m 28s
linux (tiny, gcc, native)	1m 53s
windows (HUGE, msvc, no, yes, x86)	9m 21s
macos (normal, macos-14)	4m 42s
linux (normal, clang, native)	5m 18s
windows (HUGE, mingw, yes, no, x64, yes)	11m 18s
macos (huge, macos-12)	14m 13s
linux (normal, gcc, native)	5m 18s
windows (NORMAL, msvc, yes, no, x86)	7m 2s
macos (huge, macos-14)	12m 53s
linux (huge, clang, native)	8m 53s
windows (NORMAL, mingw, no, yes, x64)	8m 18s
linux (huge, gcc, native)	10m 37s
windows (TINY, msvc, yes, yes, x64)	1m 29s
windows (TINY, mingw, no, no, x86)	2m 18s
linux (tiny, clang, nogui)	1m 44s
linux (tiny, gcc, nogui)	1m 52s
linux (normal, gcc, i386, ./src/shadow)	6m 48s
linux (huge, gcc, uchar, testgui, true, dynamic)	9m 39s
linux (huge, clang, asan, 5.1)	16m 23s
linux (huge, gcc, unittests, true)	2m 22s
linux (normal, gcc, vimtags)	2m 24s
	2h 56m 3s

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