[orca] Don't present caret-moved events from editable comboboxes as line nav

[Joanmarie Diggs <joanied src gnome org>]

commit 0fd0361f413456adaab9f257b88baa8a33e186e6
Author: Joanmarie Diggs <jdiggs igalia com>
Date:   Sat Mar 11 09:48:27 2017 -0500

    Don't present caret-moved events from editable comboboxes as line nav

 src/orca/script_utilities.py |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/src/orca/script_utilities.py b/src/orca/script_utilities.py
index 8ad204c..874420f 100644
--- a/src/orca/script_utilities.py
+++ b/src/orca/script_utilities.py
@@ -4233,6 +4233,9 @@ class Utilities:
         if not keyString in ["Up", "Down"]:
             return False
 
+        if self.isEditableDescendantOfComboBox(event.source):
+            return False
+
         return not (mods & keybindings.CTRL_MODIFIER_MASK)
 
     def lastInputEventWasLineBoundaryNav(self):