Description of the new feature/enhancement

There was this cool feature in PuTTY, that when you resize the window, it also tells you the size of the window in COLUMNS and ROWS in a small tooltip. This would make it easier for users to set the terminal to their appropriate size.

I know there is a setting for the initial size, but sometimes you want to resize your terminal to an exact size and this feature would help.

Proposed technical implementation details (optional)

Whenever the terminal window is resized by the user using either the mouse or other hotkeys, then a little tooltip will appear and show the current size (COLUMNS x ROWS) of the terminal.