Fix long response time on large IMAP folders

This closes Bug 1009
Thanks to Francois Andriot for the patch!
(cherry picked from commit b0c92b30a6)

libkmime/kmime_util.cpp

@@ -436,49 +436,26 @@ TQCString LFtoCRLF(const TQCString &s)
 
 void removeQuots(TQCString &str)
 {
-  bool inQuote=false;
-
-  for (int i=0; i < (int)str.length(); i++) {
-    if (str[i] == '"') {
-      str.remove(i,1);
-      i--;
-      inQuote = !inQuote;
-    } else {
-      if (inQuote && (str[i] == '\\'))
-        str.remove(i,1);
-    }
-  }
+  str.replace(TQRegExp("\\\""), "\"");
+  str.replace(TQRegExp("\\\\"), "\\");
 }
 
 
 void removeQuots(TQString &str)
 {
-  bool inQuote=false;
-
-  for (int i=0; i < (int)str.length(); i++) {
-    if (str[i] == '"') {
-      str.remove(i,1);
-      i--;
-      inQuote = !inQuote;
-    } else {
-      if (inQuote && (str[i] == '\\'))
-        str.remove(i,1);
-    }
-  }
+  str.replace(TQRegExp("\\\""), "\"");
+  str.replace(TQRegExp("\\\\"), "\\");
 }
 
 
 void addQuotes(TQCString &str, bool forceQuotes)
 {
   bool needsQuotes=false;
-  for (unsigned int i=0; i < str.length(); i++) {
-    if (strchr("()<>@,.;:[]=\\\"",str[i])!=0)
-      needsQuotes = true;
-    if (str[i]=='\\' || str[i]=='\"') {
-      str.insert(i, '\\');
-      i++;
-    }
-  }
+  if ( TQString( str ) .contains( TQRegExp( TQString( "\"|\\\\|=|\\]|\\[|:|;|,|\\.|,|@|<|>|\\)|\\(" ) ) ) )
+    needsQuotes = true;
+
+  str.replace(TQRegExp("\\"), "\\\\");
+  str.replace(TQRegExp("\""), "\\\"");
 
   if (needsQuotes || forceQuotes) {
     str.insert(0,'\"');