fit lsp-ui-imenu to longest line in buffer (#764) #502

Job	Run time
test (ubuntu-latest, 27.2, false)	40s
test (ubuntu-latest, 28.2, false)	48s
test (ubuntu-latest, 29.3, false)	50s
test (macos-latest, 27.2, false)	2m 49s
test (macos-latest, 28.2, false)	2m 52s
test (macos-latest, 29.3, false)	3m 7s
test (windows-latest, 27.2, false)	1m 9s
test (windows-latest, 28.2, false)	1m 3s
test (windows-latest, 29.3, false)	3m 54s
test (ubuntu-latest, snapshot, true)	41s
test (macos-latest, snapshot, true)	2m 8s
test (windows-latest, snapshot, true)	1m 4s
	21m 5s

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