Recently I had an issue in Linux Mint in which Alt+Click didn't work in Krita (or in any other application). Across image editors, Alt+Click is the input to use the eyedropper tool to sample a color on the image. It is common enough you can expect it to be there by convention, so I was surprised to realize in Linux Mint 22, Cinnamon edition, Alt+Click instead drags and moves the window by default.
How to Fix
1: open the start menu and search for "Windows." This is the name of the Cinnamon's window management settings utility.
2: click on the "Behavior" tab.
3: in "Moving and Resizing Windows" change "Special key to move and resize windows" from "<Alt>" (the default) to "Disabled." Alternatively, you can use the "<Super>" to use the Super key (Windows key).
Observations
Bad defaults: using Alt+Click for a system-level action is simply a bad decision. It can break many editors, which will make users think that the functionality is missing on the application or the application has a weird "hold alt to move the window" functionality instead of the expected default. They may also think it's a problem with the system that they can't customize, so the application functionality simply doesn't work on the system. Requiring users to Google how to fix the system so they can use an application is just not ideal. Specially considering that using the Super key instead would be the better default, as applications avoid making use of the Super key for their shortcuts by convention.
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