[R-Graphics] Adapted to changes in 'rj-core'/RJ-2.0

Signed-off-by: Stephan Wahlbrink <sw@wahlbrink.eu>
[R-Graphics] Fixed locator info in status line when using multiple views

Signed-off-by: Stephan Wahlbrink <sw@wahlbrink.eu>
[R-Graphics] Fixed locator info in status line when page was opened in
background

Signed-off-by: Stephan Wahlbrink <sw@wahlbrink.eu>