fix: prevent race conditions when applying multiple diffs in parallel

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Description

Wait for the previous edit tool to create its diff in the IDE before the next edit tool.
This caused race conditions because the code required the text editor to be active for the diff to be streamed into the proper file.

resolves CON-5048

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• [] I've read the contributing guide
• [] The relevant docs, if any, have been updated or created
• [] The relevant tests, if any, have been updated or created

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before.mp4

after.mp4

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Summary by cubic

Prevent race conditions when multiple edit tools apply diffs at the same time. We now wait for the previous apply to finish so each diff streams to the correct file.

• Bug Fixes
  • Added selectApplyStatesInProgress to track in-progress apply states.
  • Updated applyForEditTool to wait if more than one apply is active (1s polling) to serialize diff application.
  • Addresses CON-5048 by preventing diffs from appearing in the wrong file.

^{Written for commit 2e40292. Summary will update on new commits.}

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[cubic-dev-ai]

1 issue found across 2 files

Prompt for AI agents (all issues)

Check if these issues are valid — if so, understand the root cause of each and fix them.


<file name="gui/src/redux/thunks/handleApplyStateUpdate.ts">

<violation number="1" location="gui/src/redux/thunks/handleApplyStateUpdate.ts:172">
P1: Concurrent apply thunks can deadlock: the wait loop counts the current not-started apply state, so two simultaneous calls both wait forever and never call applyToFile.</violation>
</file>

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