Object designer does not work well with multi-root workspace

[PeterConijn]

When you have a multi-root workspace, the object designer no longer works well. There are two main problems:

1. There are two entries for each object;
2. Opening an object from the designer opens it in read-only mode, such as with BC BaseApp or SystemApp objects

It seems it is not taking the currently active folder into account the way the compiler is.