I use CMD+H a lot to move through my apps. It would be nice if Aseprite could stick to the standard CMD+H behaviour too.
Since 1.1.4 CMD+H is assigned to Show Extras (same as Photoshop). Photoshop has the setting to enable this shortcut or just have the default macOS behaviour, and it prompts this the very first time you open the app (do you want to use CMD+H to view extras or to hide the app?).
My suggestion would be, make Show Extras work with CTRL+H and add macOS menu items and shortcuts to handle this (Hide Aseprite CMD+H, Hide Others CMD+ALT+H...)
I know this could conflict with some (new) features such as slices. Maybe it is fine to control slicing through CTRL instead of CMD? Not sure, but I would like to see what you guys think.
(This might be related as well? https://github.com/aseprite/aseprite/issues/135)