Add collapsible interactive dialog demo with borderless and collapsed options

[krd311]

Summary

Adds a /dialog collapsible slash command to the demo plugin that opens an Interactive Dialog showcasing collapsible sections — a new DialogElement type that groups child fields under an expand/collapse toggle. This serves as the reference/demo counterpart to the server + webapp changes that introduce the feature.

Ticket Link

https://mattermost.atlassian.net/browse/MM-69315

[Copilot]

Pull request overview

Adds a new /dialog collapsible demo path to the Mattermost demo plugin, showcasing the new collapsible Interactive Dialog element type (including nested sections, default-collapsed sections, and borderless sections). This complements the corresponding server/webapp feature work by providing a practical reference dialog.

Changes:

• Added a new dialog sample (getDialogWithCollapsibleElements) demonstrating collapsible sections nested up to 3 levels, including Collapsed and Borderless variants.
• Extended /dialog help text and autocomplete to include the new collapsible subcommand.
• Wired the new subcommand into the /dialog command handler to open the new sample dialog.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
server/dialog_samples.go	Adds a new dialog definition that demonstrates collapsible dialog sections and nested child fields.
server/command_hooks.go	Adds the /dialog collapsible help/autocomplete entry and routes the new subcommand to open the collapsible demo dialog.

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Important

Review skipped

Review was skipped as selected files did not have any reviewable changes.

💤 Files selected but had no reviewable changes (1)

• server/server

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Configuration used: Organization UI

Review profile: CHILL

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Run ID: 90cd5064-9e22-4c7e-8f1a-3b9551e8d50c

📥 Commits

Reviewing files that changed from the base of the PR and between ada684a and e766963.

📒 Files selected for processing (1)

• server/server

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📝 Walkthrough

Walkthrough

This change adds a new collapsible dialog demo. It extends the slash-command help text and autocomplete tree, adds a dispatcher case that opens the dialog via a new endpoint, and introduces a dialog factory function producing nested collapsible UI sections with sample form fields.

Changes

Collapsible Dialog Feature

Layer / File(s)	Summary
Dialog sample with nested collapsible sections server/dialog_samples.go	Adds the collapsible dialog sample comment and getDialogWithCollapsibleElements() with dialog metadata, introduction text, and nested collapsible form elements.
Command wiring for collapsible dialog server/command_hooks.go	Adds /dialog collapsible help text, autocomplete registration, and the dispatcher branch that opens the new dialog sample through /dialog/3.

Estimated code review effort: 2 (Simple) | ~10 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the new collapsible interactive dialog demo and its collapsed/borderless options.
Description check	✅ Passed	The description matches the changeset by describing the /dialog collapsible demo and its role in the feature.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch kyledoliente_collapsible_sections

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[krd311]

/update-branch

[mattermost-build]

Error trying to update the PR.
Please do it manually.

[krd311]

/update-branch

[mattermost-build]

Error trying to update the PR.
Please do it manually.

[krd311]

Looks like I'm having an issue getting the build to pass due to the Elements, Collapsed, and Borderless fields I added to the model. Does anyone have any suggestions for this?