Phase 6, step 6. The window opened at 480x900 under a comment that said why:
*"The layouts have only ever been exercised at phone widths. This is a starting
size that does not immediately misrepresent them, not a considered desktop
layout."* That was honest, and it has stopped being true.
1100dp is inside the expanded breakpoint (840-1199), which is the narrowest
window M3 recommends two panes in and so the smallest opening size at which a
desktop user sees a desktop layout rather than a phone one stretched sideways.
The content does not stretch to fill it: screens are held to a readable measure
and centred, so the extra width becomes margin.
Also a minimum size, which the window never had. Compose Desktop's `WindowState`
carries no minimum, so the window could be dragged narrower than anything in the
app was written for; 400x600 is the narrowest of the five widths this phase is
meant to be checked at, and the compact breakpoint's own floor is a phone rather
than nothing.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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