MICROGL X11: avoid some of the needless redraw events

Author: 0-8-15

loaders/common/main.c

@@ -37,6 +37,13 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
 // microgl based main loop
 
+#if defined(LINUX)
+// new code path
+#define LEGACY_2021 0
+#else
+#define LEGACY_2021 1
+#endif
+
 #include "LNCONFIG.h"
 
 #include <stdio.h>

loaders/x11/x11_microgl.c

@@ -250,7 +250,7 @@ void microgl_pollevents(void)
         motion=1;
         break;
       case Expose:
-        expose=1;
+        expose = expose || (event.xexpose.width && event.xexpose.height) ? 1 : 0;
         break;
       case ClientMessage:  
         if( (Atom) event.xclient.data.l[ 0 ] == win.WMDeleteWindow )