A little update.
If I add second display, maximize application to it and window has "Visible on all workspaces" set, after removing second display window is moved to current workspace, active display maximized, but when I un-maximize the window, it's gone. I cant get it back to work with it, no matter how I try - clicking in unity launcher just switches desktops, wmctrl can't move the window and there is no possibility for me get that window in any visible area anymore. Only solution to it is - right click in unity launcher and choose "Quit".
A little update.
If I add second display, maximize application to it and window has "Visible on all workspaces" set, after removing second display window is moved to current workspace, active display maximized, but when I un-maximize the window, it's gone. I cant get it back to work with it, no matter how I try - clicking in unity launcher just switches desktops, wmctrl can't move the window and there is no possibility for me get that window in any visible area anymore. Only solution to it is - right click in unity launcher and choose "Quit".