Bug 1032634 - [Build] Make GAIA_DEV_PIXELS_PER_PX shorter (alias)
Bug 1001998 - RTL Button List (fake select) value is truncated from the right.
Bug 1016885 - Always initialize the MmiManager before sending a notification r=etienne
Merge pull request #21338 from pivanov/bug-1001998

Bug 1001998 - RTL Button List (fake select) value is truncated from the right.
Merge pull request #21318 from snowmantw/issue1032634

Bug 1032634 - [Build] Make GAIA_DEV_PIXELS_PER_PX shorter (alias)
Bug 1022755 - do not scroll if we're not in the right panel r=azasypkin
Follow-up:

* Navigation.currentPanel should be null when we're sliding
Follow-ups:

* fix the event removal in Navigation.slide()
* fix the nits in the tests