Fix undefined behaviour in TQClipboardWatcher::format

This relates to Bug 1820

src/kernel/qclipboard_x11.cpp

@@ -166,7 +166,7 @@ public:
     QByteArray getDataInFormat(Atom fmtatom) const;
 
     Atom atom;
-    QValueList<const char *> formatList;
+    mutable QValueList<const char *> formatList;
 };
 
 
@@ -1304,7 +1304,6 @@ const char* QClipboardWatcher::format( int n ) const
 	// server round trips...
 	static Atom xa_targets = *qt_xdnd_str_to_atom( "TARGETS" );
 
-	QClipboardWatcher *that = (QClipboardWatcher *) this;
 	QByteArray ba = getDataInFormat(xa_targets);
 	if (ba.size() > 0) {
 	    Atom *unsorted_target = (Atom *) ba.data();
@@ -1337,21 +1336,21 @@ const char* QClipboardWatcher::format( int n ) const
 		VQDEBUG("    format: %s", qt_xdnd_atom_to_str(target[i]));
 
 		if ( target[i] == XA_PIXMAP )
-		    that->formatList.append("image/ppm");
+		    formatList.append("image/ppm");
 		else if ( target[i] == XA_STRING )
-		    that->formatList.append( "text/plain;charset=ISO-8859-1" );
+		    formatList.append( "text/plain;charset=ISO-8859-1" );
 		else if ( target[i] == qt_utf8_string )
-		    that->formatList.append( "text/plain;charset=UTF-8" );
+		    formatList.append( "text/plain;charset=UTF-8" );
 		else if ( target[i] == xa_text ||
 			  target[i] == xa_compound_text )
-		    that->formatList.append( "text/plain" );
+		    formatList.append( "text/plain" );
 		else
-		    that->formatList.append(qt_xdnd_atom_to_str(target[i]));
+		    formatList.append(qt_xdnd_atom_to_str(target[i]));
 	    }
 	    delete []target;
 
 	    QDEBUG("QClipboardWatcher::format: %d formats available",
-		  int(that->formatList.count()));
+		  int(formatList.count()));
 	}
     }
 

src/kernel/qmime.cpp

@@ -139,8 +139,9 @@ bool QMimeSource::provides(const char* mimeType) const
 {
     const char* fmt;
     for (int i=0; (fmt = format(i)); i++) {
-	if ( !qstricmp(mimeType,fmt) )
+	if ( !qstricmp(mimeType,fmt) ) {
 	    return TRUE;
+	}
     }
     return FALSE;
 }