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Description of problem: When I switch from a high resolution external monitor to a lower resolution laptop screen, applets on the right end of MATE's panels disappear off the screen. Version-Release number of selected component (if applicable): mate-panel-1.16.0-2.fc25.x86_64 xmonad-core-0.12-2.fc25.x86_64 xmonad-mate-0.12-2.fc25.x86_64 How reproducible: 100% so far. Steps to Reproduce: 1. Set up MATE + xmonad desktop (not sure if it will also happen with plain MATE) 2. Run on laptop with different size / resolution internal and external monitors 3. With the larger screen active, place some applets on the right hand end of a MATE panel 4. Switch to the smaller monitor Actual results: Applets disappear off the right hand end of the panel. Expected results: Applets are re-layed-out to all be visible on the resized panel.
Going to panel options, temporarily disabling "Expand" then re-enabling forces a resize to the laptop screen size. However, switching to the external monitor and back again messes it up again.
I also see this with plain MATE (both w/wo compositing). It is a regression. It did not occur with FC24, but it does with FC25.
I use VNC and this has started happening in Fedora 25. I user TigerVNC and whenever I change systems, or whenever I toggle "Maximize" on the viewing console, I risk experiencing this problem. I set up new accounts with default MATE configurations and the same thing happens. I noticed one particularly odd result - In the default MATE panel layout, I have seen it such that the panel on the top resizes correctly, but the panel on the bottom does not. In my case, I prefer to maximize screen real estate for applications, so I only have a panel on the bottom. I have found that if I play with "Lock to Panel" and shift icons around, I have sometimes seemed to reproducibly solve the problem, but then a while later it seems to come back. This makes me wonder if the "Window List 1.16.0" applet on the bottom is a cause here, as this is the only thing that would be stable for a period but then change on its own. Might the "Window List" be sometimes consuming all the space, and then not reducing its usage in response to resize events?
Right after pushing "Save Changes", I realized I could test the last theory by simply removing "Window List" and seeing if the problem remained. Unfortunately, it did. Removing "Window List" didn't fix the problem. As one of the other people commented, if I toggle "Expand" on the Panel properties, it fixes.
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Seems to be fixed in current versions.