Oh wow. Ok, see I use a graphics tablet with direct pen-on-screen input. So my right hand was literally covering up that preview. I can’t hover my pen and also move my hand out of the way to see it. I plugged in an external mouse to check this feature out. But I primarily work with the screen-tablet, so this preview is practically unusable for me.
My suggested fix would be to have a “left-handed / right-handed” toggle button in the Preferences menu. It would be a simple fix that flips the position of this preview window, and other drop-down menus. This also solves some accessibility issues for all kinds of Aseprite users. For example, there some people use pen-tablets due to repetitive-stress-injury from mouse use, or have arthritis which makes a pen digitizer a medical necessity for pain/comfort reasons. It would be nice to include the left/right hand toggle for them too!
Windows has this kind of option built in for pen use, and is also an option in Accessibility settings (my righ-click menus on the desktop drop down-left from cursor instead of down-right).
I would still consider this a “bug” and not a feature request, because it is expected standard behavior for programs to adapt to pen-handedness in this way (most other Windows programs do). Especially for accessibility, like I mentioned before.
That said, I wouldn’t suggest to write some complicated code to detect specific pen devices like Windows does – a simple boolean toggle in the Aseprite Preferences menu for left/right hand menus would be preferable.
This software is amazing, keep up the good work!