Created attachment 5440 image showing differences The panel pluginis visually different from other plugins. 1) It leaves more space at its borders. Where every other icon is sized 24x24 when the panel has a size of 24px, this plugin actually adds 2px to each of its borders. This makes the panel look inconsistent around this icon. 2) The volume scroller is different from that of the brightness plugin. This is another source of inconsistency (see picture). It should use the same kind.
Closing old bugs. Mixer is being rewritten