- missing break statement caused middle mouse click to zoom one step,

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source/blender/src/space.c

@@ -586,6 +586,8 @@ void winqreadview3dspace(ScrArea *sa, void *spacedata, BWinEvent *evt)
 					else if((G.qual==0))
 						viewmove(0);
 				}
+				break;
+				
 			case WHEELUPMOUSE:
 				/* Regular:   Zoom in */
 				/* Shift:     Scroll up */