isUnfinished function

bool isUnfinished(String frame)

Whether this frame is a progress indicator that has not resolved yet.

Frames arrive one write at a time, so collapsing within a chunk is not enough: the first frame of a spinner lands in its own chunk and would be printed, leaving a stray ⠋ Generating… above every ✓ Generated…. With several services interleaved that is most of the output.

A frame still wearing a spinner glyph is unfinished by definition — the same line is about to be redrawn, and the redraw ends in ✓ or ✗, which is the part worth keeping. Anything a child prints that does not animate passes through untouched.

The glyph is looked for in the frame's visible text. A child that colours its output writes ESC[92m⠋ESC[0m Retrieving…, whose first code unit is the escape byte and not the glyph — so testing the raw string would stop matching the moment colour was turned on, and would do it silently: every frame becomes a settled line, the spinner column in the roster empties, and nothing anywhere reports an error. stripAnsi is what keeps this test about what the child drew rather than about how it drew it.

Public so a renderer that owns its own region — a per-service pane, which can redraw in place rather than only appending — can hold an unfinished frame instead of dropping it. A second copy of this test would drift from this one.

Implementation

bool isUnfinished(String frame) {
  final visible = stripAnsi(frame).trim();

  return visible.isNotEmpty && _spinnerGlyphs.contains(visible.codeUnitAt(0));
}