So the bug is that :

• open Wikipedia
• open any article
• open any image in media-viewer
• click on share button
• exit media-viewer

Now you can't write anything in wiki-search-bar or in any input field on the page ( It does not give any error msg in the console )

After the share button is clicked , some certain functions are binded on "keydown" and "keypress" events of all input fields. These functions are preventing the usual behavior.

I unbinded the "keydown" and "keypress" callbacks from wiki-search-bar through browser console and it started working fine again.
So i believe the problem lies in the attachment | detachment of callbacks on once we click the share button.