Windows

Use gtk_text_view_scroll_to_iter() to scroll to the start of the
selection area. NOTE: setSelection(0, -1) is not API and does not work
on GTK.

Tested on GTK 3.22, 3.20, 3.18, 3.16, 3.14, 3.10, and 2.24. No
additional AllNonBrowser JUnit test failures occur.

Change-Id: I7347365c76317ab0f3c2c1b8bdcb4db9769d713c
Signed-off-by: Eric Williams <ericwill@redhat.com>