Platform: Ubuntu 15.04
GEdit version: 3.10.4

Found what I think is a bug so here I am.

When pressing CTRL+S to save a new doc, the dialog window pops up. Typing anything on the keyboard replace the default name on top of the window which is the correct behaviour.

Now, in the same situation, pressing CTRL+S to save the new doc BUT double clicking on a folder to save the doc in a chosen folder, the focus shifts to File Type so when typing something on the keyboard it doesn't replace the default name but try actually to find a file type according to what you're typing (or so I think). And what you're typing appears in a text box at the bottom right above the File Type selection box.

Therefore every time the user needs to save a new doc in a particular location (different from the default location), he/she has to click on the file name field and type.

AFAIK I had already encountered this bug on previous versions of Ubuntu. Not sure however what versions of Gedit I was using at the time.

Anyway, hope that helps.

Eric