Description of the new feature/enhancement

VTE only rewraps the contents of the (normal screen + its scrollback buffer) on a resize event. It doesn't rewrap the contents of the alternate screen.

Rationale:

The alternate screen is used by applications which repaint it after a resize event. So it doesn't really matter.

However, in that short time window, after resizing the terminal but before the application catches up, this prevents vertical lines (e.g. the user interface of mc) from becoming ugly tilted.