Why do you need stopPropagation in a file explorer click handler?
Because folders are nested. Clicking a child folder would also trigger the parent folder's click handler (event bubbling). stopPropagation prevents this, so only the clicked folder toggles.
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More FAQs in File Explorer Expand/Collapse Implementation
Add a click handler to folder elements. Toggle the children container's display between 'none' and 'block'. Update the folder icon. Use e.stopPropagation() to prevent parent folders from toggling when a child is clicked.
Select all children containers and set their display: expandAll sets all to 'block', collapseAll sets all to 'none'. Also update all folder icons accordingly.
Use a Set to track expanded folder paths. Add to the Set on expand, delete on collapse. On re-render, check if a path is in the Set and set the display accordingly. Optionally save to localStorage.
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