I thought I recorded this bug already can't find it. This behavior was okay up until 1.18 and since 1.19wmf1 was deployed, it is breaking.
Steps to reproduce
- When logged out, visit a url to an existing view but without a title query parameter, for example:
- Click Login in the top left and continue the login procedure
The "Back to ..." link should go to where I was
The link says "Main page" and goes to /wiki/Main_Page, no query at all.
I could understand if it assumes the title 'Main Page' if none was found in the originating url (although even that is somewhat unneeded, since MediaWiki knows the page title by the time the page is rendered, based on oldid and/or pageid). But instead of it becoming ?title=Some_page&originalquery or ?originalquery, it becomes /wiki/Main_Page.