How to get rid of 'read-only' on region when mouse-copying it from jabber mode ?

[xani666]

Hi,

I've noticed a very weird thing, everytime I am trying to mouse copy text from 
jabber-mode (version 20140225), resulting paste is a read-only text region.


I've reproduced it on empty (well, almost, got some configuration to connect to 
server) .emacs config, it only happens on mouse and in jabber-mode, keyboard 
killing and then yanking region works fine

Any ideas on what it can be and how to change it?

Cheers,

Mariusz