Window titlebar and controls disappears behind upper panel with a dual monitor setup stacked, not side by side

[malheum]

Hello,

I have a dual monitor setup on an Ubuntu 18.04 64 bits install with the mate desktop 1.20 environment.

The dual monitors are not side by side, but stacked one above the other. My primary monitor is the lower monitor, the secondary monitor is the one above the primary.

I have an upper and a lower panel on my primary screen.

Desktop environment is mate 1.20 from Ubuntu.

Now when I maximize any window on the primary screen the window titlebar with the controls ( minimize, maximize, close ) disappear behind the upper titlebar and is thus hidden.

The calculation of the available maximal window size is bugged when monitors are stacked upon each other.

When I change my monitors' configuration to have the monitors side by side the calculation of the available size to maximize a window is correct - that however is not my physical setup.

BR
M.

[malheum (maxheise)]

I have added five screenshots to better illustrate.

The first screenshot shows the monitor's configuration stacked up each other.

The second screenshot shows a terminal window on the primary screen, not maximized with the titlebar and the window controls showing.

The third screenshot is the terminal on the primary screen after I have maximized it. The titlebar and the window controls are missing/hidden, have disappeared.

The fourth screenshot shows a terminal window on the secondary screen, not maximized with the titlebar and the window controls showing.

The fifth screenshot is the terminal on the secondary screen after I have maximized it. The titlebar and the window controls are correctly shown as expected.

[Maarten (mraeymaekers)]

I have exactly the same experience in Ubuntu Mate 19.10.

Since the external monitor is above the laptop monitor, and the primary monitor remains the laptop (bottom) monitor, whenever maximizing application windows on the laptop monitor, the title bar (including the window controls) disappear behind the menu bar.

[Maarten (mraeymaekers)]

Related to this: in this same setup (laptop screen is bottom display, external monitor is top display), when I change the primary display to the top monitor (so the menu bar is shown on top and the window panel is shown at the bottom of this top monitor), the bottom part of maximized open windows disappears behind the bottom window panel.