D-N2 dismissed portrait with one number: a 12-inch tablet is about 1024
logical pixels across, which clears the expanded breakpoint. That was
worked out for a 4:3 panel. The tablet's is 3000 by 1920, and on that
aspect a column beside the photograph in portrait leaves it a strip 540
wide and 1456 tall: a 3:2 frame gets 540 by 360 where a column below it
would give 900 by 600, and the portrait frame gains too.
D-N7 records the decision: a third property beside the layout class,
derived from the window's aspect with hysteresis, that lays the same
rail, canvas and column out on the other axis. Not a sheet, not a second
layout, and the rail does not move. N6 measures the device the numbers
were guessed for, N7 does the frame with the stack stretched as a
stopgap, N8 moves the develop callbacks onto a global so the panels can
be declared twice cheaply, and N9 is the three-column composition the
dock's width is actually for. N5's "no strip along the bottom" is struck
where D-N7 reverses it and kept where it does not.
dtourolle
de32c04a68