[orca] Handle caret offsets of -1 when getting the text of non-focused objects

[Joanmarie Diggs <joanied src gnome org>]

commit b6c615ac4e3bfb8373ad6b98c2af8b22939da002
Author: Joanmarie Diggs <jdiggs igalia com>
Date:   Wed Dec 19 13:30:17 2012 +0100

    Handle caret offsets of -1 when getting the text of non-focused objects

 .../scripts/toolkits/Gecko/script_utilities.py     |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/orca/scripts/toolkits/Gecko/script_utilities.py b/src/orca/scripts/toolkits/Gecko/script_utilities.py
index a659b41..4559c36 100644
--- a/src/orca/scripts/toolkits/Gecko/script_utilities.py
+++ b/src/orca/scripts/toolkits/Gecko/script_utilities.py
@@ -528,7 +528,7 @@ class Utilities(script_utilities.Utilities):
         text = self.queryNonEmptyText(obj)
         if text:
             if offset == None:
-                offset = text.caretOffset
+                offset = max(0, text.caretOffset)
 
             if boundary:
                 [string, start, end] = \