Borders on some notifications with frame_width = 0

[victorbnl]

Issue description

Unexpected borders appear around some notifications (see tests 3, 7 and 8).

If you test it multiple times, you’ll see it doesn’t happen on random notifications. I think it depends on their position instead.

Installation info

• Version: 1.9.2 (2023-04-20)
• Install type: package
• Window manager / Desktop environment: i3
• Distro: Arch

Minimal dunstrc

[global]
    separator_height = 6
    separator_color = "#000000ff"

    frame_width = 0
    frame_color = "#ff0000ff"

    font = Cantarell 11

[urgency_normal]
    background = "#141414"

[victorbnl]

Setting frame_color = "#00000000" works as a workaround.

[bynect]

This is probably related to #1241

[bynect]

Seeing this again, it may be a rounding error in the drawing code. I will investigate

[bynect]

I can reliably confirm this. I will try to rework the drawing code a bit to remove it