flowchart TB
    Root["Root"]
    TabBar["TabBar<br/>(fixed height)"]
    Workspace["Workspace<br/>(split tree, fills the screen)"]
    Panes["panes<br/>(ratio sized)"]
    CmdLine["CmdLine<br/>(pinned leaf, 1 row)"]

    Root --> TabBar
    Root --> Workspace
    Workspace --> Panes
    Workspace --> CmdLine