fix(flights): a stalled feed dims the tracked aircraft as STALE

When the whole feed backs off, no poll counts a miss, so the tracked
aircraft read STALE at full brightness while no newer position came in.
It now takes the same stale fade as a missed update, in the flights and
military layers.

src/layers/flights/tracking.js

@@ -859,8 +859,8 @@ export function createTracking({
    * - SIGNAL LOST · <time since its last report>, dimmed: its coast has ended
    *   (or it holds at its last report after a missed update) and no newer
    *   report has come.
-   * - STALE, dimmed: it has missed an update and still coasts.
-   * - STALE, not dimmed: the whole feed is backing off.
+   * - STALE, dimmed: it has missed an update and still coasts, or the whole
+   *   feed is backing off.
    * @param {string} icao24
    * @returns {{text: string, dimmed: boolean}}
    */
@@ -902,8 +902,8 @@ export function createTracking({
           : `${formatNumber(Math.floor(sec / 60), { useGrouping: false })} ${unitLabel('min')}`;
       return { text: t('SIGNAL LOST · {time}', { time }), dimmed: true };
     }
-    if (missed) return { text: t('STALE'), dimmed: true };
-    if (backoff) return { text: t('STALE'), dimmed: false };
+    // A missed update or a stalled feed: no newer position is coming in.
+    if (missed || backoff) return { text: t('STALE'), dimmed: true };
     return { text: '', dimmed: false };
   }
 

src/layers/flights/trailRecord.test.mjs

@@ -791,6 +791,26 @@ test('a repeated old fix counts as a missed update for the tracked plane', () =>
   }
 });
 
+test('a stalled feed dims the tracked plane as STALE', () => {
+  const { fixes, info } = outOfCoverage();
+  const h = harness({ fixes, info, nowMs: pastReport(-5) });
+  try {
+    h.tracking._startTrail(ICAO);
+    h.run(pastReport(-2));
+    // The whole feed is backing off: no poll counts a miss, and no newer
+    // position is coming in.
+    h.flightState.feed._backoff = true;
+    assert.deepEqual(h.tracking._trackedStaleCue(ICAO), {
+      text: 'STALE',
+      dimmed: true,
+    });
+    assert.equal(h.tracking._trackedIconColor().alpha, STALE_ALPHA);
+    assert.equal(h.flightState.records.missingPolls.has(ICAO), false);
+  } finally {
+    h.restore();
+  }
+});
+
 test('a report arriving after the plane has stopped: it eases in with no spur, and the trail keeps everything up to the stop', () => {
   const { fixes, info } = outOfCoverage();
   info.lastContactEpochMs = fixes.at(-1).epochMs;

src/layers/military/tracking.js

@@ -230,8 +230,8 @@ export function createTracking({
    * - SIGNAL LOST · <time since its last report>, dimmed: its coast has ended
    *   (or it holds at its last report after a missed update) and no newer
    *   report has come.
-   * - STALE, dimmed: it has missed an update and still coasts.
-   * - STALE, not dimmed: the whole feed is backing off.
+   * - STALE, dimmed: it has missed an update and still coasts, or the whole
+   *   feed is backing off.
    * @param {string} icao24
    * @returns {{text: string, dimmed: boolean}}
    */
@@ -273,8 +273,8 @@ export function createTracking({
           : `${formatNumber(Math.floor(sec / 60), { useGrouping: false })} ${unitLabel('min')}`;
       return { text: t('SIGNAL LOST · {time}', { time }), dimmed: true };
     }
-    if (missed) return { text: t('STALE'), dimmed: true };
-    if (backoff) return { text: t('STALE'), dimmed: false };
+    // A missed update or a stalled feed: no newer position is coming in.
+    if (missed || backoff) return { text: t('STALE'), dimmed: true };
     return { text: '', dimmed: false };
   }
 

src/layers/military/trailRecord.test.mjs

@@ -642,6 +642,26 @@ test('military: a repeated old fix counts as a missed update for the tracked pla
   }
 });
 
+test('military: a stalled feed dims the tracked plane as STALE', () => {
+  const { fixes, info } = outOfCoverage();
+  const h = harness({ fixes, info, nowMs: pastReport(-5) });
+  try {
+    h.tracking._startTrail(ICAO);
+    h.run(pastReport(-2));
+    // The whole feed is backing off: no poll counts a miss, and no newer
+    // position is coming in.
+    h.flightState.feed._backoff = true;
+    assert.deepEqual(h.tracking._trackedStaleCue(ICAO), {
+      text: 'STALE',
+      dimmed: true,
+    });
+    assert.equal(h.tracking._trackedIconColor().alpha, STALE_ALPHA);
+    assert.equal(h.flightState.records.missingPolls.has(ICAO), false);
+  } finally {
+    h.restore();
+  }
+});
+
 test('military: a report arriving after the plane has stopped: it eases in with no spur, and the trail keeps everything up to the stop', () => {
   const { fixes, info } = outOfCoverage();
   info.lastContactEpochMs = fixes.at(-1).epochMs;