[orca] Explicitly clear text selection when controlling navigation in web content

[Joanmarie Diggs <joanied src gnome org>]

commit 4e365b7184ba392b59314b112df69810ad5f4fd6
Author: Joanmarie Diggs <jdiggs igalia com>
Date:   Fri Apr 19 13:50:17 2019 -0400

    Explicitly clear text selection when controlling navigation in web content

 src/orca/script_utilities.py             | 5 ++---
 src/orca/scripts/web/script_utilities.py | 9 +++++++++
 2 files changed, 11 insertions(+), 3 deletions(-)
---
diff --git a/src/orca/script_utilities.py b/src/orca/script_utilities.py
index 187867647..832c69692 100644
--- a/src/orca/script_utilities.py
+++ b/src/orca/script_utilities.py
@@ -2634,8 +2634,7 @@ class Utilities:
 
         return offset
 
-    @staticmethod
-    def clearTextSelection(obj):
+    def clearTextSelection(self, obj):
         """Clears the text selection if the object supports it.
 
         Arguments:
@@ -2648,7 +2647,7 @@ class Utilities:
             return
 
         for i in range(text.getNSelections()):
-            text.removeSelection(0)
+            text.removeSelection(i)
 
     def expandEOCs(self, obj, startOffset=0, endOffset=-1):
         """Expands the current object replacing EMBEDDED_OBJECT_CHARACTERS
diff --git a/src/orca/scripts/web/script_utilities.py b/src/orca/scripts/web/script_utilities.py
index 85155c1b3..37ab493d9 100644
--- a/src/orca/scripts/web/script_utilities.py
+++ b/src/orca/scripts/web/script_utilities.py
@@ -385,6 +385,7 @@ class Utilities(script_utilities.Utilities):
         if self._script.focusModeIsSticky():
             return
 
+        self.clearTextSelection(orca_state.locusOfFocus)
         orca.setLocusOfFocus(None, obj, notifyScript=False)
         if grabFocus:
             self.grabFocus(obj)
@@ -3662,6 +3663,14 @@ class Utilities(script_utilities.Utilities):
 
         return rv
 
+    def clearTextSelection(self, obj):
+        super().clearTextSelection(obj)
+        if self.isDocument(obj):
+            return
+
+        for child in obj:
+            self.clearTextSelection(child)
+
     def clearCaretContext(self, documentFrame=None):
         self.clearContentCache()
         documentFrame = documentFrame or self.documentFrame()