When opening the outliner context menu with multiple data types
selected, the menu did not show operators related to the target of the
cursor. For example, if a modifier and object are selected, a right
click on the modifier does not show the modifier options, rather it
shows the object context menu.
Now the data type of the right-click element is used to determine the
context menu to draw. For this to work properly the active element is
now set on right click.
Part of T77408
Manifest Task: https://developer.blender.org/T77770
Differential Revision: https://developer.blender.org/D8647
b0741e1dcb