Lineage lines used to draw one glowing dashed bezier per parent/child pair,
hanging below the tab strip, for every family at once. With a parent on row 3
of a wrapped strip and ten children below it, the curves crossed every lower
row's tab names and ran through the terminal text.
- One rounded orthogonal tree per spawning tab: every route starts at the
parent, so siblings share a trunk. 1.5px, solid, 1px dark outline; only a
working child's branch is dashed.
- Routes run only through the gaps between tab rows, joined by a spine left of
every row (computeLineageTree/computeLineageRows in constants.js), so they
never cross a tab or reach the terminal. The vertical rail gets the same tree
on its existing left track.
- Only the selected tab's family is drawn (what it spawned, plus its parent and
siblings). Selection redraws, and the strip's size transitionend redraws once
more, since the active tab widens for ~150ms after the selection redraw.
- The routing room is reserved by .session-tabs.lineage-tree, keyed on whether
any lineage exists, never on the selection, so a tab switch never resizes the
header or the PTY.
- Colours stay per spawning tab, now claimed in strip order for every family so
selection order never decides who gets the skin blue.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
An iOS-style focus pull: the thing arrives out of focus and the blur fades
off it as the opacity comes up. Opacity leads the blur (full opacity around
45%, blur still lifting), which is what separates it from a cross-fade.
Ships on tabs (440ms), agent windows (560ms), the terminal pane (520ms) and
connection lines (380ms), plus a `Soft focus` theme that sets all four.
Default stays `legacy`, so an untouched install is unchanged.
The terminal pane is the one surface that cannot blur itself the documented
way, and `blur` takes a deliberate exception to the "never a filter on
.terminal-container" rule. Every alternative was measured against a live
xterm and does not work: a backdrop-filter veil on ::before blurs perfectly
while STATIC, and Chrome silently drops the backdrop the moment ANY
animation runs on that pseudo-element (the veil computes blur(15.3px) while
the text behind it stays razor sharp); driving the radius from rAF buys the
same full-screen blur per frame plus main-thread work. The cost the rule
exists to avoid is inherent to blurring a terminal, so the style buys it
knowingly: opt-in, off by default, one ~520ms run per session open, class
straight back off, will-change still unset. Worst-case price, headless
SwiftShader with no GPU: frame deltas 16.7ms -> 33.3ms for the run, against
16.7ms flat for `fade`. cols x rows measured unchanged at 178x38 before,
during and after, so FitAddon never sees it.
The line entrance animates `filter` too, where each line already carried
its glow. Both kinds now hold it in --line-glow and both keyframes say
`blur(N) var(--line-glow)`, so the function lists match and interpolate
instead of the glow vanishing for the run and popping back (a lineage
line's glow is a different colour, set per element). Its 100% frame omits
`opacity` on purpose so the endpoint comes from the element's own resting
value: 0.9 subagent, 0.72 lineage, 0.95 working.
test/entrance-animations.test.ts is a new static guard over the whole
feature, not just this style: the rule -> keyframes -> theme-option chain a
style silently does nothing without, the terminal's paint-only property
allowlist (the FitAddon rule), the --line-glow contract, and reduced-motion
coverage. Mutation-checked both ways.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Codeman maintainer