Bug 5420741: exception when rotating device while suggestion popup is visible

The suggestion popup window was not dismissed on orientation change.
This is triggered by onDetachedFromWindow.
However, this method is also called when the suggestion popup window
pops up. A new flag detects that case to dismiss the popup unless it
has expressly been asked to show up.

Still errors in the log after that change, I assume related to the window manager.

Change-Id: Ia515fc576ddf2127b2f9863cc2652aeb619fff6e