OrbitControls: fix Orthographic 'change' event (mrdoob#27424)

* OrbitControls: fix Orthographic 'change' event

Signed-off-by: Guilherme Avila <3927951+sciecode@users.noreply.github.com>

* OrbitControls: only recalculate when zoom has changed

Signed-off-by: Guilherme Avila <3927951+sciecode@users.noreply.github.com>

* clean-up

Signed-off-by: Guilherme Avila <3927951+sciecode@users.noreply.github.com>

---------

Signed-off-by: Guilherme Avila <3927951+sciecode@users.noreply.github.com>

Author: sciecode

examples/jsm/controls/OrbitControls.js

@@ -373,10 +373,15 @@ class OrbitControls extends EventDispatcher {
 					}
 
 				} else if ( scope.object.isOrthographicCamera ) {
+					
+					zoomChanged = scale !== 1;
 
-					scope.object.zoom = Math.max( scope.minZoom, Math.min( scope.maxZoom, scope.object.zoom / scale ) );
-					scope.object.updateProjectionMatrix();
-					zoomChanged = true;
+					if ( zoomChanged ) {
+
+						scope.object.zoom = Math.max( scope.minZoom, Math.min( scope.maxZoom, scope.object.zoom / scale ) );
+						scope.object.updateProjectionMatrix();
+						
+					}
 
 				}