I created a user defined command:MC.Explorer.NewBrowser PATH="${focusfilepath}" SIDE=TARGET
MC.SetActivePanel PANEL=INACTIVE
And gave them the simple hotkey Right-Arrow.
This User defined command create a new tab on target panel with the path of the folder or file in focus. This is a very useful command, i use it every day.
But the new tab start with a different size of the folder tree.
If i use Ctrl+T for creating a new tab-copy on source-panel, the size are not wrong. Also if starting a New MC instance without using the bat file the size are not wrong.