04eccdfa7a
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A `position:fixed; inset:0` scrim is only viewport-relative while nothing
establishes a containing block for fixed descendants. VerticalTabsLayout sets
`contain:layout` on .vtl-content, so inside the cap-5 studio every such scrim
covered the CONTENT PANE instead. Measured at a 1280x900 viewport:
.dt-scrim / .modal-scrim / .lt-overlay ... 1024x793 @ (256,107)
captured by div.vtl-content [contain:layout]
256 is the rail width, 107 the header height — left uncovered and CLICKABLE
behind what still looks like a modal. The fix (library/utils/viewportScrim.js)
measures the real origin and subtracts it, rather than removing the shell's
contain, which is load-bearing for a different reason.
This adds the gate that keeps it fixed. A source grep cannot: every one of these
scrims greps as a correct inset:0, because the variable is the ANCESTOR, not the
declaration — and which ancestors exist depends on the HOST, not the component.
check:scrim-viewport:self-test reverts each scrim to plain inset:0 and requires
EVERY case to fail; a gate that cannot fail is worse than no gate, and this one
measures a property that looks fine in a screenshot either way. The self-test
also surfaced that .lt-overlay is captured TWICE — div.lt-root [transform] as
well — collapsing it to 233x30 rather than merely to the pane.
SemanticTreeLegend's .stl-export-backdrop is fixed the same way but marked as
NOT verified through the UI: it sits behind SHOW_EXPORT_BUTTON = false, so the
menu that owns it cannot be opened. Correct-if-enabled, not observed.
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| facet-cascade-rows.json | ||
| facet-one-field-rows.json | ||