The window's content runs the full height underneath the title bar, so
the shell covers the bar - and a webview covering the bar swallows the
gesture that moves the window. The strip standing in for it now says it
is a drag region.
That strip also moves inside each column instead of spanning both, so the
rule between the nav and the app runs the whole height of the window
rather than starting below the bar.
Vincent
0ae5746a30