JEGA/JVGA: Only update renderer override on master, do not update CRTC cursor location unless it's either master or slave, and only override the text mode renderer - fixes AX Windows 3.0 386 enhanced mode returning from DOS box to full screen.

src/video/vid_ega.c

@@ -783,10 +783,7 @@ ega_poll(void *priv)
             ega->y_add *= ega->vres + 1;
             for (y = 0; y <= ega->vres; y++) {
                 /* Render scanline */
-                if (ega->render_override)
-                    ega->render_override(ega->priv_parent);
-                else
-                    ega->render(ega);
+                ega->render(ega);
 
                 /* Render overscan */
                 ega->x_add = (overscan_x >> 1);