7413a8a4f0
The dolly operators poll function was set to `view3d_rotation_poll` instead of `view3d_zoom_or_dolly_poll` which reads like a mistake. As it happens this didn't cause any user visible problems because RV3D_LOCK_ZOOM_AND_DOLLY is only set when all other locks are set. Nevertheless, logically the dolly operator should check that dolly is not locked. Updated the poll function for dolly to check neither rotation or zoom/dolly is locked with comments noting why both are needed. Also expand on code-comments for why dolly enforces perspective view.
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