Two different causes, both from the same root — the header was raised to
z-[1100] so the Plant Map's Leaflet controls (z-1000) could not scroll over
it, which quietly pushed my overlays underneath it.
The toast sat at z-60 and the Add Invoice dialog at z-50, both below the
header, so a confirmation appeared to vanish behind the nav bar. Rung out
against the existing ladder instead of picking a new number: header 1100,
nav drawer 1200, dialog 1250, toast 1300. The toast and the combobox list sit
at the same layer deliberately — they never open at the same time.
The machine dropdown was a separate and worse bug: it was not merely behind
anything, it was CLIPPED. It rendered inside the line table's overflow-x-auto
container, so the list was cut off by the table edge and the card around it —
it could never escape, which is why the search appeared to do nothing.
It now renders through a portal into <body>, positioned from the input's
measured viewport rect, so no ancestor can clip it. The rect is measured
before paint so it never flashes in the wrong place, kept in sync with
scroll and resize, and the list flips upward when there is not enough room
below — which is the common case on a phone with the keyboard open.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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