Previously, we sometimes replaced the url with the plain /wiki/Page article path when there were query parameters in the edit session. This was wrong and fixed by T44553. However it failed to account for the opposite case which is far more common. E.g. the user goes from /wiki/Page into /w/index.php?title=Page&veaction=edit. When exiting the editor the veaction parameter is removed, the user should go to /wiki/Page but the logic for T44553 is keeping the user on the index.php-style url because of there being "one or more" query parameters.
While the on-click handler for Edit moves the user to /wiki/Page?veaction=edit, the underlying html href (used when opening in a new tab) does go to index.php.
Let's exclude the "title" key from this query so that users are less likely to reside on non-canonical urls. Thus making it more likely that they end up reading the article over the canonical urls and share those with other people. This also improved caching and performance.