The bookmark circle isn't drawn correctly.

[CowThing]

Godot version:
3.2 alpha 1

OS/device including version:
Windows 10 64bit

Issue description:
The bookmark circle's pixels are not correct, the right and left sides are not even. I guess this is an issue with the draw_circle function. It might be better if this circle is replaced with a texture so that it can be drawn nicely and have anti-aliasing. Here is a scaled up screenshot for reference.

[akien-mga]

CC @Calinou @Paulb23

[Calinou]

It makes sense to use an icon for bookmarks indeed, so that it can be antialiased.

[KoBeWi]

I considered this icon at the original PR: https://github.com/alefragnani/vscode-bookmarks/blob/master/images/bookmark.svg

It's free to use AFAIK.

[Paulb23]

Yeah, breakpoints should become a large circle icon, with a banner icon similar to the one that @KoBeWi linked for bookmarks.

[CowThing]

I do like that bookmark icon. And making breakpoints large circles would help them stand out more.