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Issue: Despite seemingly correct Stimulus controller (`selection_controller.js`) setup, HTML attributes (`data-controller`, `data-action`, `data-target`), and CSS, the "Delete Selected" button remained disabled even when I checked items.
Context: Extensive troubleshooting performed: Verified controller registration (`stimulus:manifest:update`, `controllers/index.js`), `javascript_importmap_tags` in layout, `controllers/application.js` initialization. Added `console.log` statements; logs did not appear in the browser console, indicating the controller code was not executing. Tested moving `data-controller` scope. Checked for conflicts/errors.
Resolution: Due to the inability to diagnose why the Stimulus controller wasn't connecting/executing, I reverted the dynamic disabling feature for simplicity. I deleted the controller file, removed the registration, cleaned the `data-` attributes from view/layout, and removed CSS styles.
Learning: If JavaScript behavior (especially Stimulus) fails without obvious errors after checking standard setup (loading, registration, attributes, initialization, console logs), I learned to consider potential deeper issues: asset pipeline problems, JS bundling errors (check network tab/console thoroughly), subtle DOM interactions (e.g., Turbo Frames replacing elements Stimulus was connected to), typos in `data-` attributes or controller identifiers, or timing issues. Sometimes reverting to a simpler solution is pragmatic if debugging proves too complex or time-consuming for the feature's value.

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