Wire up the completion worker into the editor widget
Display completion results
Proper escaping for filename completion candidates
Ensure that searching for completion data in HTML is not too slow inside large blocks of text
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Line up the descriptions properly
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Fix color of highlighted text item
Fix make_highlighted_text to work with XML unsafe text
Add side margins and correct height calculation
Mouse interaction for completion popup
Dont popup completion when pressing modifier keys
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Choosing completion candidates now works
Clear completion cache when file is edited

(uses a debounce timer for performance)
Clear completion caches after book altering operations
Completion for anchors