fix for #190215. multi-line properties in string bundles don't work on win32.

this isn't a blocker, but it's bad enough to take for the respin.
patch by alecf.  r/sr=sspitzer, a=kyle

mailnews/base/resources/locale/en-US/messenger.properties

@@ -224,7 +224,6 @@ mailnews.search_date_format=0
 mailnews.search_date_separator=
 
 # offline msg 
-
 nocachedbodybody=The body of this message has not been downloaded from \
 the server for reading offline. To read this message, \
 you must reconnect to the network, choose Offline from \
@@ -241,10 +240,9 @@ mailAcctType=Mail
 newsAcctType=News
 
 # LOCALIZATION NOTES(nocachedbodytitle): Do not translate "<TITLE>" or "</TITLE>" in the line below
-nocachedbodytitle=<TITLE>Go Online to View This Message</TITLE>\n\
+nocachedbodytitle=<TITLE>Go Online to View This Message</TITLE>\n
 
 # mailWindowOverlay.js
-
 confirmUnsubscribeTitle=Confirm Unsubscribe
 confirmUnsubscribeText=Are you sure you want to unsubscribe from %S?
 cannotHaveTwoFilterRulesDialogs=Filter Rules Dialog

xpcom/ds/nsPersistentProperties.cpp

@@ -141,7 +141,8 @@ class nsParserState
 {
 public:
   nsParserState(nsIPersistentProperties* aProps) :
-    mState(eParserState_AwaitingKey), mProps(aProps) {}
+    mState(eParserState_AwaitingKey), mHaveMultiLine(PR_FALSE),
+    mProps(aProps) {}
 
   void WaitForKey() {
     mState = eParserState_AwaitingKey;
@@ -184,7 +185,8 @@ public:
   PRUint32 mSpecialState;
 
   PRUint32  mUnicodeValuesRead; // should be 4!
-  PRUnichar mUnicodeValue;
+  PRUnichar mUnicodeValue;      // currently parsed unicode value
+  PRBool    mHaveMultiLine;     // if this key is multi-line
 
 private:
   PRUint32 mState;
@@ -263,19 +265,34 @@ ParseValueCharacter(nsParserState& aState, PRUnichar c,
   case eParserSpecial_None:
     switch (c) {
     case '\\':
-      aState.mSpecialState = eParserSpecial_Escaped;
+      // handle multilines - since this is the beginning of a line,
+      // there's no value to append
+      if (aState.mHaveMultiLine)
+        aState.mHaveMultiLine = PR_FALSE;
+      else
         aState.mValue += Substring(tokenStart, cur);
+      
+      aState.mSpecialState = eParserSpecial_Escaped;
       break;
       
     case '\n':
     case '\r':
+      // ignore sequential line endings
+      if (aState.mHaveMultiLine)
+        break;
+      
       // we're done! We have a key and value
       aState.mValue += Substring(tokenStart, cur);
       aState.FinishValueState(oldValue);
       break;
 
     default:
-      // there is nothing to do with normal characters
+      // there is nothing to do with normal characters,
+      // but handle multilines correctly
+      if (aState.mHaveMultiLine) {
+        aState.mHaveMultiLine = PR_FALSE;
+        tokenStart = cur;
+      }
       break;
     }
     break;
@@ -314,6 +331,7 @@ ParseValueCharacter(nsParserState& aState, PRUnichar c,
       // a \ immediately followed by a newline means we're going multiline
     case '\r':
     case '\n':
+      aState.mHaveMultiLine = PR_TRUE;
       aState.mSpecialState = eParserSpecial_None;
       break;