Update outputs combobox

[Ichunjo]

This PR makes the line edit of the ouputs combo boxes as read only to prevent the user to write in it while still allowing them to select the text.
Additionally, the line edit is now displaying the index number of the outputs.

[Setsugennoao]

Why would you not want it to be writeable?

[Ichunjo]

Why would you want to be writeable instead? You can't add new outputs by typing them so it doesn't really make sense to have it writeable. Plus if it's writeable like it is currently you have to click the small arrow to get the drop-down menu. With this change you can click anywhere on the combobox to open it.

[Vodes]

It's editable so you can change the node names before making a comp if need be

[Setsugennoao]

I also don't like it displaying the index

[Ichunjo]

It's editable so you can change the node names before making a comp if need be

If that’s the only reason, I’d suggest making this feature in the comp plugin itself then.

I also don't like it displaying the index

Any reason why? set_output now allows choosing the index number, it would make sense to display the vs index as well.

[emotion3459]

See discussion starting here