Can confirm:
1. Open a new gnome-terminal
2. Press Ctrl-Shift-t
3. Press Ctrl-d
4. Press Ctrl-Shift-t
Every time you do this, terminal gets bigger by one line.
** Changed in: gnome-terminal (Ubuntu)
Status: Unconfirmed => Confirmed
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Terminal resizes when changing tab
https://launchpad.net/bugs/53157