Calculate exception regions when an active statement is deleted#5744
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tmat merged 1 commit intodotnet:masterfrom Oct 7, 2015
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Calculate exception regions when an active statement is deleted#5744tmat merged 1 commit intodotnet:masterfrom
tmat merged 1 commit intodotnet:masterfrom
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tmat
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Calculate exception regions when an active statement is deleted
jjonescz
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Apr 28, 2026
* Fix HTML completion race when typing too quickly
- There was a race when typing too quickly our synchronization mechanism would try and reduce the work that was done to cancel pre-existing requests. So in the scenario when you were to type `<tr` what would happen is that 3 completion requests would fire:
1. Triggered completion for `<`
2. Typing completion for `t`
3. Typing completion for `r`
Now when we sped things up we were able to process requests in parallel which meant that we could handle simultaneous requests for `<`, `t` and `r` all at the same time; however, this in turn results in an interesting behavior where if we ask for completion at `r` while `<` and `t` are still active our synchronization mechanism would aggressively cancel the older requests. For completion this is catastrohpic because it would result in a 0 length completion list because HTML does not respect completion requests beyond trigger characters and the beginning of the word.
- To fix this issue I added a new mechanism for synchronization which takes a flag `rejectOnNewerParallelRequest` which states do not reject a synchronization request aggressively if this flag is `true`. Now this doesn't mean the requests never get rejected. If there's a batched document update or document close / open this will still reject the document; it just means that on the requesting of synchronization that older completion requests are not rejected eagerly.
- Added tests to our projection and synchronization stack to account for this
- Ensured that these changes are not breaking changes so marked some bits as virtual.
### Before
### After
Fixes dotnet#5743
* Update src/Razor/src/Microsoft.VisualStudio.LanguageServer.ContainedLanguage/LSPDocumentSynchronizer.cs
Co-authored-by: Allison Chou <allichou@microsoft.com>
* Fix newer tests.
Co-authored-by: Allison Chou <allichou@microsoft.com>
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Fixes internal bug 131449: VS crashed when active statement in catch or finally clause was deleted or commented out.