SettingsActivity does not inherit from BaseActivity which caused
the preferred locale not to be set. This was not apparent when
switching to the Settings screen as the preferred locale would
already have been set by a previous activity which does inherit
from BaseActivity (e.g. RemoteActivity). Therefore we needed
to explicitly set the preferred locale as well in SettingsActivity.
* Allow the RemoteActivity and BaseMediaActivity to show a volume controller dialog when hardware volume keys are pressed
** The dialog handles the key events and makes callbacks to the activities to handle showing the dialog itself
* Minor improvements
** Make HighlightButton render in the IDE GUI Editor
** Minor code cleanup
** set currentActivePlayerId = -1; on playerOnStop in BaseMediaActivity to be more consistent
resolvesxbmc/Kore#235
Martijn Brekhof
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