use Truncate instead of SetLength(0); r=cmanske, sr=bz, bug=209548

editor/composer/src/nsEditorSpellCheck.cpp

@@ -223,7 +223,7 @@ nsEditorSpellCheck::GetSuggestedWord(PRUnichar **aSuggestedWord)
     mSuggestedWordIndex++;
   } else {
     // A blank string signals that there are no more strings
-    word.SetLength(0);
+    word.Truncate();
   }
 
   *aSuggestedWord = ToNewUnicode(word);
@@ -288,7 +288,7 @@ nsEditorSpellCheck::GetPersonalDictionaryWord(PRUnichar **aDictionaryWord)
     mDictionaryIndex++;
   } else {
     // A blank string signals that there are no more strings
-    word.SetLength(0);
+    word.Truncate();
   }
 
   *aDictionaryWord = ToNewUnicode(word);

editor/libeditor/html/nsHTMLEditorStyle.cpp

@@ -1844,7 +1844,7 @@ nsHTMLEditor::GetFontFaceState(PRBool *aMixed, nsAString &outFace)
   if (!aMixed)
       return NS_ERROR_FAILURE;
   *aMixed = PR_TRUE;
-  outFace.SetLength(0);
+  outFace.Truncate();
 
   nsresult res;
   PRBool first, any, all;
@@ -1872,7 +1872,7 @@ nsHTMLEditor::GetFontFaceState(PRBool *aMixed, nsAString &outFace)
   if (!any)
   {
     // there was no font face attrs of any kind.  We are in normal font.
-    outFace.SetLength(0);
+    outFace.Truncate();
     *aMixed = PR_FALSE;
   }
   return res;
@@ -1884,7 +1884,7 @@ nsHTMLEditor::GetFontColorState(PRBool *aMixed, nsAString &aOutColor)
   if (!aMixed)
       return NS_ERROR_NULL_POINTER;
   *aMixed = PR_TRUE;
-  aOutColor.SetLength(0);
+  aOutColor.Truncate();
   
   nsresult res;
   NS_NAMED_LITERAL_STRING(colorStr, "color");
@@ -1902,7 +1902,7 @@ nsHTMLEditor::GetFontColorState(PRBool *aMixed, nsAString &aOutColor)
   if (!any)
   {
     // there was no font color attrs of any kind..
-    aOutColor.SetLength(0);
+    aOutColor.Truncate();
     *aMixed = PR_FALSE;
   }
   return res;

editor/libeditor/html/nsTableEditor.cpp

@@ -3343,7 +3343,7 @@ nsHTMLEditor::GetSelectedOrParentTableElement(nsAString& aTagName,
   NS_ENSURE_ARG_POINTER(aTableElement);
   NS_ENSURE_ARG_POINTER(aSelectedCount);
   *aTableElement = nsnull;
-  aTagName.SetLength(0);
+  aTagName.Truncate();
   *aSelectedCount = 0;
 
   nsCOMPtr<nsISelection> selection;

editor/libeditor/text/nsInternetCiter.cpp

@@ -73,7 +73,7 @@ NS_IMPL_ISUPPORTS1(nsInternetCiter, nsICiter)
 NS_IMETHODIMP
 nsInternetCiter::GetCiteString(const nsAString& aInString, nsAString& aOutString)
 {
-  aOutString.SetLength(0);
+  aOutString.Truncate();
   PRUnichar uch = nl;
 
   // Strip trailing new lines which will otherwise turn up
@@ -121,7 +121,7 @@ nsInternetCiter::StripCitesAndLinebreaks(const nsAString& aInString,
   if (aCiteLevel)
     *aCiteLevel = 0;
 
-  aOutString.SetLength(0);
+  aOutString.Truncate();
   nsReadingIterator <PRUnichar> beginIter,endIter;
   aInString.BeginReading(beginIter);
   aInString.EndReading(endIter);

editor/libeditor/text/nsTextEditRules.cpp

@@ -1099,7 +1099,7 @@ nsTextEditRules::WillOutputText(nsISelection *aSelection,
     }
     else if (mBogusNode)
     { // this means there's no content, so output null string
-      aOutString->SetLength(0);
+      aOutString->Truncate();
       *aHandled = PR_TRUE;
     }
   }
@@ -1324,7 +1324,7 @@ nsTextEditRules::TruncateInsertionIfNeeded(nsISelection *aSelection,
     PRInt32 resultingDocLength = docLength - selectionLength - oldCompStrLength;
     if (resultingDocLength >= aMaxLength) 
     {
-      aOutString->SetLength(0);
+      aOutString->Truncate();
       return res;
     }
     else
@@ -1342,7 +1342,7 @@ nsTextEditRules::TruncateInsertionIfNeeded(nsISelection *aSelection,
 nsresult
 nsTextEditRules::ResetIMETextPWBuf()
 {
-  mPasswordIMEText.SetLength(0);
+  mPasswordIMEText.Truncate();
   return NS_OK;
 }
 
@@ -1379,7 +1379,7 @@ nsTextEditRules::EchoInsertionToPWBuff(PRInt32 aStart, PRInt32 aEnd, nsAString *
   // change the output to '*' only
   PRInt32 length = aOutString->Length();
   PRInt32 i;
-  aOutString->SetLength(0);
+  aOutString->Truncate();
   for (i=0; i<length; i++)
   {
     aOutString->Append(PRUnichar('*'));