Grese pencil fills without gaps

I've noticed when you fill with grease pencil, the fills often have little gaps next to each other: for example, if I draw a filled area using the draw tool, then do another fill in the same colour next to it, when I zoom in there will be little tiny spots along the border that are unfilled for some reason. They don'y show up at all zoom levels because of scaling, which is annoying.

Would it be possible to have fill edges match each other exactly? Particularly if they are the same colour!