I think the code for resizing the popup window isn't working properly anymore

[jikamens]

I just received a report from the user that the pop-up window is cutting off some of the content for them.

While working on another add-on recently I observed that the attempts to resize the pop-up window are operating on the underlying window rather than on the pop-up window. I think something may have changed in Thunderbird such that the window ID being returned is the wrong window, it's the underlying compose window rather than the pop-up window.

I need to track this down and potentially may need to refactor the resize code or indeed refactor how we are handling this problem in general.