Refactor lsp--document-highlight-callback to check window visibility … #5381

Job	Run time
test (ubuntu-latest, 27.2, false)	2m 12s
test (ubuntu-latest, 28.2, false)	2m 39s
test (ubuntu-latest, 29.4, false)	2m 19s
test (macos-latest, 28.2, false)	3m 34s
test (macos-latest, 29.4, false)	3m 46s
test (windows-latest, 27.2, false)	3m 51s
test (windows-latest, 28.2, false)	4m 35s
test (windows-latest, 29.4, false)	5m 2s
test (ubuntu-latest, snapshot, true)	1m 33s
test (macos-latest, snapshot, true)	3m 45s
test (windows-latest, snapshot, true)	7m 46s
	41m 2s

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