Where chart furniture lives, as distinct from pane furniture.
A price line belongs to a pane. A brand mark, a corner clock or a session
badge belongs to the CHART: it should sit at an edge of the whole stack, and
follow that edge as indicator panes come and go. chart-bottom is the common
case, and it also survives maximize, which hides the other panes entirely and
would otherwise take a pane-0 watermark with it.
Where chart furniture lives, as distinct from pane furniture.
A price line belongs to a pane. A brand mark, a corner clock or a session badge belongs to the CHART: it should sit at an edge of the whole stack, and follow that edge as indicator panes come and go.
chart-bottomis the common case, and it also survives maximize, which hides the other panes entirely and would otherwise take a pane-0 watermark with it.