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\"ErrorList\" title contains \"...\" and it never goes away. and it can confuse users that error list is still updating while it is already done.\r\n\r\n### Bugs this fixes\r\n\r\nhttps://github.com/dotnet/roslyn/issues/23764\r\n\r\n### Workarounds, if any\r\n\r\nthere is no workaround.\r\n\r\n### Risk\r\n\r\nlow risk. not something that can cause crash.\r\n\r\n### Performance impact\r\n\r\nLow\r\n\r\n### Is this a regression from a previous update?\r\n\r\nYes.\r\n\r\n### Root cause analysis\r\n\r\nthis fix introduced this race - https://github.com/dotnet/roslyn/pull/23623\r\n\r\nbasically, previously, we didn't account work that are still running (ex, last work that is running). we start and stop progress bar as first work is enqueued to the work queue and as last work is dequeued. which can be misleading since last work might still running even if progress bar said work is done. so the PR above changed progress bar to consider work still running, but failed to change logic on when we 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