BUG #14392: Fix selection modifiers for chart views.

Added ability to change selection modifier while in selection mode as mentioned
in the bug report for BUG #14392.

Change-Id: I24afaf591fd972995dc209e4b7d1f0ba5abf87e3
Merge topic '14392_fix_modifiers' into next

1404bdf BUG #14392: Fix selection modifiers for chart views.