Please describe the problem:
Some buttons have dropdown menus, accessible through an arrow on their right side. When a window is too narrow to show all the buttons in the menu bar, some buttons on the right are hidden under an arrow on the right side of the menu bar. When one of those buttons has a dropdown menu, that menu becomes inaccessible.

Steps to reproduce:
1. Install Gnote and start it.
2. Click on the task bar icon and Create New Note
3. The Notebook button in the menu bar has a submenu
4. Make the window narrow enough so that the Notebook button is hidden
5. Click on the arrow on the right side of the menu bar to access the hidden Notebook button


Actual results:
No arrow for a submenu appears beside the Notebook button.

Expected results:
Seeing an arrow next to the Notebook button, so I can click it to access the submenu. So I expect it to behave the same as when the window is wide enough to show the Notebook menu.

Does this happen every time?
Yes.

Other information:
I don't know any other other application that has a similar button with a submenu on the right, so I'm not completely sure if this is a bug in Gnote or in Gtk. I experienced this on the gnewsense-mips-l distribution on a Lemote Yeeloong laptop.