New defaults: Smoothly resize window, guioptions+=k #816

Job	Run time
build-and-test (macos-13, 15.2, vimtags, check-xcodeproj-compat)	36m 52s
build-and-test (macos-14, 15.4, true)	36m 39s
build-and-test (macos-15, 16.2, true, true)	45m 50s
	1h 59m 21s

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