2cb8b4b7f7
When starting a navigation operation that uses `Auto Depth` or `Orbit Around Selection` the value of `#RegionView3D::dist` is modified to match the distance from the new pivot. This value was incorrect when the pivot was behind the viewer. In these cases `dist` is negative. This commit, in addition to fixing `dist`, also limits the execution of this code to only when `Auto Depth` is used. Pull Request: https://projects.blender.org/blender/blender/pulls/122795