Automatically remember the app's maximization state
On some screens, particularly small/medium-sized laptops, particularly for non-technical users, it is best to remember the maximization state and restore that property on startup (independently of width/height).
For instance, on my aunt's 12" laptop screen, and since she does single-tasking (no window management), and she's not very good with handling the cursor (whether with a mouse or touchpad), it makes a lot more sense for me to maximize the Loupe window once and for all, so that any image she browses through are always shown at maximum size by default, completely dodging problems like #218 (closed). So in a sense, this can also be an accessibility issue for some non-technical people who aren't really at ease with window management (sizing, moving, maximizing/unmaximizing, etc.).
Maybe the tiling (ex: half-tiled) state should also be remembered, if possible (I don't know if apps have access to that information).