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* Plot: a layout's saved page setup is used by default (#2493) A layout whose page setup says plot window, scale to fit or a plot scale was plotted 1:1 from the sheet origin unless the caller passed fit. plot, exportpdf, the PNG device and preview now read the layout's saved window, scale to fit, scale and centring when the options don't say (render::paper::saved_plot); explicit options win, and fit: false without a scale is still the plain 1:1 sheet. Tests: saved_setup_tests in pdf.rs (four), and preview_uses_the_layouts_saved_page_setup_by_default. * Parity checklist: regenerated after merging main * Parity checklist: regenerated after merging main * Plot: saved page setup in preview and PNG matches the PDF (review on #2586) Preview honours the saved centre when fitting a window and an explicit scale beats a saved scale to fit (PDF too); PNG places a saved window without fit and clips to the printable area. * Preview: a saved window clips to the printable area (review on #2586) The preview drew the placed plot over the margins while the PDF and PNG blank them. The blanking helper now lives in the render crate and both the PNG plot and the preview use it. Test: preview_clips_a_saved_window_to_the_printable_area. * Preview: pin hostile saved page setups and the default setup (review on #2586) Degenerate or far-away saved windows and saved scales of 0 or not finite already fall back to the plain plot in the PDF, PNG and preview; tests now pin that, and that a layout with no saved setup plots as before. * Preview: the printable clip follows the view's fit (review on #2586) The clip assumed the sheet filled the image; when the height cap applies View::fit scales and centres it. The printable corners now go through View::to_screen. Test: preview_clip_follows_the_view_when_the_height_cap_applies. * docs: leave the generated parity checklist to maintainers Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> --------- Co-authored-by: Brandon Thomas <echelon@gmail.com> Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>