[Feature Request] double-click a tab to change its title

[Gydo Kosten]

I want to suggest a small but impactful (to me, at least) quality-of-life improvement: double-clicking a tab to change it's title.
xfce4-terminal has this, and I have found it to be of great value, since it saves time compared to right-clicking and selecting 'Set Title'.

Expected behaviour

Double-clicking on a tab should switch to that tab, then invoke the "Set Title" dialog.

[Gydo Kosten]

I would like to work on this myself, as my first contribution to MATE!