Last modified: 2014-03-04 06:56:29 UTC
In IE, on Special:Upload, hitting the Enter key when wpDestFile is focused causes the upload to fail silently, bringing the user back to the Special:Upload screen, with little indication as to what happened. I noticed this behavior on MW 1.16.0, and confirmed that it still happens on MediaWiki.org, which is currently running 1.16wmf4 (r76474). This problem does not occur in Firefox or Safari. I have only tested IE 8 - I do not know what other IE versions are affected.
Could verify this if user deleted filename, which seems low priority, but need to double check if this occurs if the user *doesn't* delete filename, which is higher priority
I was wrong, it's not about blanking the field. It's about a form submitted (accidentally or by design) by pressing enter. The reason this happens is that SpecialUpload.php will only process an upload if the parameter 'wpUpload' is present; in other words, if the user clicked the button. IE doesn't send the button's name or value if you don't click it. Looks like just a bug, although it seems deliberate so I want to be careful. So far it's hard to determine exactly when 'mUploadClicked' became mandatory.
Reassigning to wikibugs-l per bug 37789
