Copy/paste context menus are rendered incorrectly

[eloquence]

#1063 introduced copy & paste (yay!). However, as originally observed here, the "Copy/Select All" context menu for journalist replies is rendered incorrectly:

I'm able to use the "Copy/select all" right-click menu just fine on source messages. When I attempt to use it on replies, it pops up, but it does not respond to the keyboard, the "Copy" menu is enabled (it's disabled for messages), and mousing over the menu options does not highlight the selected menu entry. The menu stays in the state illustrated by the screenshot.

The "Select all" action does work when you click it, but the "Copy" action does not until you select something, i.e. it is in fact disabled, even though it is rendered as enabled.

For some reason the menu also has extra padding on it for replies that it doesn't have for source messages.

Of lower severity, the selection color in the context menu for source messages (when you mouse over a menu option like "Select all") is white on grey, rendering options nearly invisible when you attempt to select them.

(All testing in master running in sd-app in Qubes.)