[Lazarus] Anchordocking -> CloseAll is hiding the mainform and close all forms

[Andreas Frieß]

Hello,

i use the anchordocking with manual docking and i see, if i use 
DockManager.CloseAll ALL forms are closed and the mainform is hidden.

Q: Is this expected ? I expect only the docked forms are closed and the 
mainform wil hold their own state (visible/hidden).

Andreas