Steps to reproduce: * Make the terminal window fullscreen. ==> It fills the screen completely, edge to edge, both vertically and horizontally. * Log out or restart the computer, log in again. ==> The terminal is restored, but it is not fullscreen: It has borders on all sides and is a little bit smaller than fullscreen, a small part of the desktop background is visible around it (which is very ugly). However, according to the window manager, it should be fullscreen: The second button on the right in the titlebar is not "maximize" (as it would be in non-maximized windows), but "unmaximize", and pressing it indeed makes the terminal smaller, not fullscreen. Only after pressing it a second time, the terminal is really fullscreen (edge to edge). The 4.x versions didn't have that problem: It filled the screen completely after session restore.
To make things clear: This bug report is not about "fullscreen" mode (without titlebar), but about a "maximized" terminal window (full screen with titlebar).
Status?
Fixed in current git version.