fix: Reply in DM button not visible if no DM exists already

[try-catch-stack]

Proposed changes (including videos or screenshots)

This PR fixes the Reply to DM button logic which was not visible if a user did not already have a DM with the other user. It was introduced in #36217

So if a user had create-d permission but did not already have a DM with the other user, value of canReplyInDM would become false.

Issue(s)

Steps to test or reproduce

Further comments

Summary by CodeRabbit

• Bug Fixes
  • Fixed an inverted logic condition in the reply-in-direct-message action. The feature's availability now correctly aligns with user permissions for direct message creation, ensuring the action is properly enabled or disabled based on account settings.

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[coderabbitai]

Walkthrough

A guard condition in the canReplyInDM check was inverted, changing from requiring canCreateDM to requiring !canCreateDM to proceed with DM room and subscription checks. This alters when the Reply in Direct Message action becomes available based on DM creation permission.

Changes

Cohort / File(s)	Summary
Message toolbar DM reply action guard logic apps/meteor/client/components/message/toolbar/useReplyInDMAction.ts	Inverted the conditional in the canReplyInDM guard: changed from requiring canCreateDM to requiring !canCreateDM to enter the DM path, flipping when dmRoom and dmSubs presence checks are bypassed versus enforced

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

• Guard condition logic inversion: Verify the intent behind flipping canCreateDM to !canCreateDM and confirm it aligns with expected behavior
• Action availability impact: Test that the Reply in Direct Message action is now enabled/disabled at the correct times
• Related behavior: Check if this change was intentional (bug fix) or if it introduces a regression affecting user permissions

Poem

🐰 A guard stood tall, but logic flipped,
Now !canCreateDM shows its grip!
When users can't create, the path runs free,
Direct messages flow more carefully.
One small invert, one big shift to see! 🌟

Pre-merge checks and finishing touches

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarizes the main change: fixing the Reply in DM button visibility issue when no DM exists, which directly matches the core logic inversion from the code summary.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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📥 Commits

Reviewing files that changed from the base of the PR and between 355d26d and af0a286.

📒 Files selected for processing (1)

• apps/meteor/client/components/message/toolbar/useReplyInDMAction.ts (1 hunks)

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Files:

• apps/meteor/client/components/message/toolbar/useReplyInDMAction.ts

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🔇 Additional comments (2)

apps/meteor/client/components/message/toolbar/useReplyInDMAction.ts (2)

52-62: Fix correctly addresses the stated bug.

The inversion from canCreateDM to !canCreateDM properly fixes the issue where users with create-d permission couldn't see the Reply in DM button when no existing DM existed. Now:

• Users with create-d skip this guard entirely and can always initiate a DM reply
• Users without create-d must have an existing DM room (though see note on line 33 about shouldFindRoom)

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33-33: Verify: Confirm the intended behavior for users without create-d permission.

The concern about logical inconsistency between shouldFindRoom (line 33) and the !canCreateDM check (line 56) requires examination of the complete code flow. Specifically, how shouldFindRoom is used by downstream hooks and whether users without create-d permission should be able to reply in existing DMs.

If users without create-d permission are intentionally blocked from reply-in-DM for all cases, the current logic is correct. If they should be able to reply in existing DMs but create new ones, the condition may need adjustment.

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