Sorry to comment on such an old issue! It seems that only filling the grid-tile when the grid is visible can be bewildering if you're on a 1x1 grid, especially using the app for the first time. Perhaps an "Obey Grid" option on the paint bucket could make this less confusing?

While I haven't run into this issue before since I didn't use the grid yet, I can agree that this would've been really confusing on a small grid without reading this first, an option somewhere would be good, with a way to inform the user if the option isn't in an obvious place when selecting the grid/bucket

Masondesu is right. This "feature" made the software more difficult to use. When someone use the bucket, the expected behaviour is filling with paint. Currently nothing happens and you end up having no clue on what went wrong. Misleading and over complicated behaviour. This cannot be the default.

hi @derloopkat, ok, I'll change the "stop at grid" unchecked by default which is the common behavior on common painting programs