Fix T61777: Proportional editing does not influence all objects in edit mode
- The biggest change is in transform_conversions.c::set_prop_dist(...). When searching for the nearest selected vertex the current implementation of the set_prop_dist only looks for the nearest selected vertex from a single object, in this patch the function searches all selected vertices across all objects.
- Many functions with the name createTransXxxxx have had small changes made so that when proportional editing, the TransDataContainer will be filled even if that object has no selected vertices.
- A check has been made to make sure there is at least one selected vertex, if none are found the transform operation exits early.