Enable copy for partially highlighted messages

[jlo62]

It would be nice to be able to copy such highlighted text with ctrl+c:

[SilverRainZ]

Good point.

I might know the reason. The Gtk.Label::copy-clipboard signal does what you want, and it is enabled by default, but Srain keeps focus on the input buffer (Convenient for users to input at any time), so ctrl+c can't be correctly sent to the label widget.

I will try to fix it, but not very soon, I am no longer active on IRC and can not be a good maintainer now :'( If anyone wants to help, feel free to file PR.