1. Go to some page and edit in VE
2. Click the "Link" toolbar button, type "Category:" and click a category that appears

The leading colon is correctly added, but the category now appears in red in the dropdown as if non-existent (although it shows up under "matching pages", not "new pages").

Probably, the link inspector should be ignoring/stripping the preceding colon when checking whether the page exists.

Same thing for links to File: pages.

Version: unspecified
Severity: normal