Bug 322903 AccessibleText getTextAtOffset should not cause html pane

scrolls (fix the reverse inputs)
r=aaronleventhal sr=neil

accessible/src/atk/nsAccessibleText.cpp

@@ -542,7 +542,7 @@ nsresult nsAccessibleText::GetTextHelper(EGetTextType aType, nsAccessibleTextBou
   //turn off nsCaretAccessible::NotifySelectionChanged
   gSuppressedNotifySelectionChanged = PR_TRUE;
 
-  PRInt32 caretOffset;
+  PRInt32 caretOffset = -1;
   if (NS_SUCCEEDED(GetCaretOffset(&caretOffset))) {
     if (caretOffset != aOffset)
       SetCaretOffset(aOffset);
@@ -551,6 +551,11 @@ nsresult nsAccessibleText::GetTextHelper(EGetTextType aType, nsAccessibleTextBou
   *aStartOffset = *aEndOffset = aOffset;
   rv = GetTextHelperCore(aType, aBoundaryType, aOffset, aStartOffset, aEndOffset, selCon, domSel, aClosure, aText);
 
+  //restore caret offset
+  if (caretOffset >= 0) {
+    SetCaretOffset(caretOffset);
+  }
+
   //turn on nsCaretAccessible::NotifySelectionChanged
   gSuppressedNotifySelectionChanged = PR_FALSE;