Scrolling on a tree/sitemap zooms in to the left instead of the center of the current view or mouse position

I've noticed that when I'm viewing a tree/sitemap and I scroll with my mouse wheel to zoom in or out, the focal point of the zoom always seems to be the left-most side of the tree. It doesn't seem to matter where my mouse is or what part of the tree I'm viewing, it always zooms in our out toward/from the left. It makes it really annoying when I have a wide canvas since I have to zoom in, pan to the right, zoom in more, pan to the right, etc. Ideally, scrolling should either zoom in or out in relation to the current screen view (zooming toward the center of the screen) or in relation to my mouse (zooming toward the current position of the cursor).