I don't believe this is a Geary bug specifically. This affects Shotwell as well, in both its sidebar and the plugin list (in Edit -> Preferences).
(Also in Shotwell's Edit -> Preferences, there's an excessive amount of whitespace between the checkboxes and their associated text.)
Another example: if you install and run Nautilus, View -> Sidebar -> Tree, the sidebar arrows exhibit the same behavior.
I believe this is a theme bug.
I don't believe this is a Geary bug specifically. This affects Shotwell as well, in both its sidebar and the plugin list (in Edit -> Preferences).
(Also in Shotwell's Edit -> Preferences, there's an excessive amount of whitespace between the checkboxes and their associated text.)
Another example: if you install and run Nautilus, View -> Sidebar -> Tree, the sidebar arrows exhibit the same behavior.
I believe this is a theme bug.