Bug 5248215: Even though I turned off the Spelling correction, it still shows up

Bug 5313754: SpellCheckSession is released when the window loses focus.

When an EditText is initialized with text, a new spell check is initiated
and previous spell check spans are removed.
Requires a new flag to prevent this from happening when the window focus
change comes from the suggestion popup window being shown.

Also fixes bug 5329588: handle spell check language change.

Change-Id: I113229dbe06863d34c1369d05d067292894f73f1