* we were assuming that the source of a 'new folder' thing always

* we were assuming that the source of a 'new folder' thing always
  was the main-window; however, it can also be the Move-To-Folder.
  if that was the case, we were crashing (even in sbox).

fixed this by checking for the source of the new-folder thing,
  and added a ptr to the internal ModestFolderView in the
  Move-To-Dialog as  a gobject parameter, so we can retrieve it
  later and set the focus correctly.

  One question remains: are there any other places where we show
  ModestFolderViews?

  Fixes: NB#78807

pmo-trunk-r3967