Wiki that never loses unsaved content, keeps all revisions, has pretty URLs and double-click editing

Question

I need a FLOSS wiki for installation on a GNU/Linux server that comes with the following features:

Clean URLs. Allow visiting specific pages by typing their URL from memory. Example: https://wiki.example.com/PHP to visit the wiki page titled "PHP" and https://wiki.example.com/PHP/edit to visit its edit form.

Keep all revisions. Don’t purge them, don’t keep only the last n revisions per page.

Double-click editing. Double-click anyhwere on a page to load its edit form.

Never lose unsaved content. Use caching/JavaScript magic to prevent losing unsaved content when a user tries to submit an edit but lost Internet connection, or accidentally uses the Back button while editing, or closes the browser while in edit mode. These "drafts" don’t have to (but may) be saved on the server-side.

Answer 1

I am biased, but MediaWiki does this.

• Clean URLs: see https://www.mediawiki.org/wiki/Manual:Short_URL . MediaWiki's URLs are designed for free linking, no ugly IDs.
• Keep all revisions: MediaWiki doesn't delete anything! https://www.mediawiki.org/wiki/Principles
• Double-click: that's a preference available in MediaWiki core for section-editing.
• NEVER losing content is quite a hard promise to make, but I've not losted content editing MediaWiki for a long time now... browsers work quite well nowadays and MediaWiki is on the simple textareas side, no surprises. However, there is https://www.mediawiki.org/wiki/Extension:Drafts for additional defenses.