See:
The size seems to vary depending on the context.
The post’s raw content is:
You can get a little more space by hiding the toolbar with the [wrap=icon id=bars][/wrap] button at the top right.
But when it’s quoted, it becomes
You can get a little more space by hiding the toolbar with the  button at the top right.
(fun fact: it’s the first topic to use the discourse-icon tag besides the component’s official topic)