(In reply to comment #0)
> While looking for a way to launch a new application window instead of
> activating an already running instance (is there one btw?)

Right click -> Open New Window

(In reply to comment #1)
> (In reply to comment #0)
> > While looking for a way to launch a new application window instead of
> > activating an already running instance (is there one btw?)
> 
> Right click -> Open New Window

I obviously meant the keyboard :)

This is still broken in 3.0.x. Pressing alt+enter will give you a break character. It's displayed as a solid block but you can copy/paste it somewhere else to confirm that it's indeed a break.

I can't reproduce that with GNOME Shell 3.5.91

I can reproduce this even on clutter's test-text-field. Patch coming.

Created attachment 223859 [details] [review]
text: Don't accept new line characters in single line mode

Modified Return key presses don't trigger ::activate so we would end
up adding an unprintable character to a single paragraph mode pango
layout which renders it as a box.

Review of attachment 223859 [details] [review]:

looks okay

Attachment 223859 [details] pushed as ea50df6 - text: Don't accept new line characters in single line mode