The first and third issues are indeed covered in the bugs you linked. The second, however isn't:
2) When clicking on the main menu button, sometimes the panel hides itself and the menu pops up too low -- the bottom of the menu is aligned with the bottom of the screen instead of the top of the (still un-hiden) panel.
If you look at the screenshots I attached, they show two bugs at the same time. The one from bug #30146 is that the menus are truncated. The one I had in 2) is that the toplevel menu opened too low (hiding part of the panel). These may or may not be related.
The first and third issues are indeed covered in the bugs you linked. The second, however isn't:
2) When clicking on the main menu button, sometimes the panel hides itself and the menu pops up too low -- the bottom of the menu is aligned with the bottom of the screen instead of the top of the (still un-hiden) panel.
If you look at the screenshots I attached, they show two bugs at the same time. The one from bug #30146 is that the menus are truncated. The one I had in 2) is that the toplevel menu opened too low (hiding part of the panel). These may or may not be related.