Virtualized console logs#1940
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The All Problems tab (and other ConsoleLogs tabs) previously rendered
every BaseError via {#each}, producing ~5 DOM nodes per entry. On a plan
with 20k+ activity validation errors that put 100k+ nodes in the layout
tree, which made every global style invalidation (e.g. opening any
Stellar dropdown's focus trap) run a full recalc and forced 500ms+
UpdateLayoutTree on each click.
Virtualize the list with @tanstack/svelte-virtual using a stable
`const virtualizer` plus reactive `setOptions`, so the measurement cache
and scroll position survive prop updates (every $allProblems emit would
otherwise destroy them). Wire the virtualizer's onChange callback into
a scrollTick counter that participates as an explicit dep of the
totalSize/virtualItems reactives — the wrapper emits same-reference
writable updates that don't reliably retrigger Svelte template
expressions, and the canonical recreate pattern would lose scroll/
measurement state on every backend update.
Render the scroll container unconditionally (toggled via class:invisible
when there is nothing to show) so bind:this resolves before onMount,
matching the working canonical test setup. Move the empty state to a
sibling overlay so it can coexist with the always-mounted virtualized
list.
Also drop the competing overflow-y-auto on the Console slot wrapper —
it was acting as an outer scroll boundary that swallowed scroll events
the virtualizer needed to see.
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