fix: auto-deactivate other active Stackable plugin

[kaeizen]

Summary by CodeRabbit

• New Features
  • Automatic conflict detection when multiple Stackable versions are active. The plugin now deactivates the other active version to prevent issues and ensure stability.
  • Displays a one-time admin notice after deactivation, clearly indicating which version was disabled, including build/version details.
  • Runs on activation and stores temporary info to support the notification, providing transparency without requiring manual checks.

[github-actions]

🤖 Pull request artifacts

file	commit
pr3574-stackable-3574-merge.zip	e49ce39

[github-actions]

Try this Pull Request in the WordPress playground: https://playground.wordpress.net/?mode=seamless#{"landingPage":"/wp-admin/post-new.php?post_type=page","preferredVersions":{"php":"latest","wp":"latest"},"steps":[{"step":"login","username":"admin","password":"password"},{"step":"installPlugin","pluginZipFile":{"resource":"url","url":"https://raw.githubusercontent.com/gambitph/Stackable/artifacts/pr3574-stackable-3574-merge.zip"}}]}

[bfintal]

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[coderabbitai]

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Walkthrough

Adds cross-plugin conflict handling in plugin.php: on activation, checks for another Stackable plugin, deactivates it, and stores its info in an option. If deactivation occurred, shows an admin notice with the other plugin’s version/build, then deletes the stored option.

Changes

Cohort / File(s)	Summary
Cross-plugin conflict handling & admin notice plugin.php	Added stackable_multiple_plugins_check() to detect/deactivate another Stackable plugin and save its info; registered activation hook. Added stackable_notice_other_stackable_plugin_deactivated() to display admin notice using saved info; conditionally hooked into admin_notices and cleans up the option.

Sequence Diagram(s)

sequenceDiagram
  autonumber
  actor Admin
  participant WP as WordPress
  participant This as This Stackable Plugin
  participant Other as Other Stackable Plugin

  Admin->>WP: Activate This Plugin
  WP->>This: run_activation_hook()
  This->>WP: is_plugin_active(Other)
  alt Other is active and different
    This->>WP: deactivate_plugins(Other)
    This->>WP: update_option(stackable_other_stackable_plugin_info, {file, BUILD, VERSION})
  end

  Admin->>WP: Load Admin Dashboard
  WP->>WP: get_option(stackable_other_stackable_plugin_info)
  alt Option exists
    WP->>This: add_action('admin_notices', notice)
    This->>Admin: Print notice with Other BUILD/VERSION
    This->>WP: delete_option(stackable_other_stackable_plugin_info)
  end

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Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

Poem

I thump my paws with gentle flair,
One Stackable stays, we keep it fair.
The other bows with a versioned wink,
A tidy hop—no broken link.
In admin fields the notice sings,
Peace restored on plugin wings. 🐇✨

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📥 Commits

Reviewing files that changed from the base of the PR and between fee8401 and e49ce39.

📒 Files selected for processing (1)

• plugin.php (2 hunks)

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• Commit unit tests in branch fix/stackable-buttons-style-error

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