Unclear behavior of windows in Dock Layer

[arsonoff]

What algorithm of calculation from what side of the screen is the dock-window?
Whether it is possible to set it manually?

Example:
I place the dock-window in the left part of the screen, width is slightly less than a quarter of the screen, height is more than width.
OK. Maximize-windows take the empty seat between this window and borders of the screen:

I increase width to the quarter of the screen or slightly more. The Maximize-window begins to hide under dock:

I transfer the dock-window to the right border of the screen. OK:

I increase the dock-window width that it there was more than height (on ~ 20 pixels). The Maximize-window rises up though there is no place:

I reduce dock-window height from below. Only when the lower bound of the dock-window will reach height ~ 1/4 screens, the Maximize-window will move down:

bug:
When closing the dock-window often the area of the screen is not freed and maximize-windows are not unwrapped on all screen (as though the dock-window still exists)