[orca] Eliminate some false positives detecting broken text from CSS

[Joanmarie Diggs <joanied src gnome org>]

commit fabc1da9e3bd07cc534193e47b9a4e8fe5e16731
Author: Joanmarie Diggs <jdiggs igalia com>
Date:   Mon Jul 29 09:36:42 2019 -0400

    Eliminate some false positives detecting broken text from CSS

 src/orca/scripts/web/script_utilities.py | 29 +++++++++++++++++++++--------
 1 file changed, 21 insertions(+), 8 deletions(-)
---
diff --git a/src/orca/scripts/web/script_utilities.py b/src/orca/scripts/web/script_utilities.py
index 9f501f2c1..9aec65280 100644
--- a/src/orca/scripts/web/script_utilities.py
+++ b/src/orca/scripts/web/script_utilities.py
@@ -2708,14 +2708,27 @@ class Utilities(script_utilities.Utilities):
         except:
             return False
 
-        boundary = pyatspi.TEXT_BOUNDARY_LINE_START
-        for i in range(nChars):
-            string, start, end = text.getTextAtOffset(i, boundary)
-            if len(string) > 1:
-                rv = False
-                break
-        else:
-            rv = True
+        if not nChars:
+            return False
+
+        try:
+            obj.clearCache()
+            state = obj.getState()
+        except:
+            msg = "ERROR: Exception getting state for %s" % obj
+            debug.println(debug.LEVEL_INFO, msg, True)
+            return False
+
+        # Note: We cannot check for the editable-text interface, because Gecko
+        # seems to be exposing that for non-editable things. Thanks Gecko.
+        rv = not state.contains(pyatspi.STATE_EDITABLE)
+        if rv:
+            boundary = pyatspi.TEXT_BOUNDARY_LINE_START
+            for i in range(nChars):
+                string, start, end = text.getTextAtOffset(i, boundary)
+                if len(string) > 1:
+                    rv = False
+                    break
 
         self._elementLinesAreSingleChars[hash(obj)] = rv
         return rv