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improve chat @/# completion #700

Job	Run time
test (ubuntu-latest, 28.2)	48s
test (windows-latest, snapshot)	1m 58s
test (windows-latest, 28.1)	1m 30s
test (macos-latest, 29.4)	4m 48s
test (ubuntu-latest, snapshot)	38s
test (windows-latest, 29.4)	1m 19s
test (ubuntu-latest, 29.4)	37s
test (macos-latest, 30.2)	5m 25s
test (macos-latest, 28.1)	4m 53s
test (ubuntu-latest, 28.1)	43s
test (macos-latest, 28.2)	4m 53s
test (ubuntu-latest, 30.2)	42s
test (macos-latest, snapshot)	2m 46s
test (windows-latest, 30.2)	1m 22s
test (windows-latest, 28.2)	1m 49s
	34m 11s