Transcript Incremental Projection

Nucleic-Session: 0FFD007B-0696-4517-9429-129C7B0FD5AC Co-authored-by: Nucleic <[email protected]>
2026-07-06 19:33:05 -07:00
parent e0509d019d
commit 0e942400d5
1 changed files with 9 additions and 2 deletions
@@ -600,14 +600,21 @@ struct TranscriptList: View {
    /// The band is wider than any bar-height delta, so only a deliberate scroll crosses it.
    private let bottomUnfollowThreshold: CGFloat = 64

-    /// The live scroll phase, used to tell *user* scrolling (finger down / flick decelerating)
+    /// The live scroll phase, used to tell *user* scrolling (an active drag / flick decelerating)
    /// from programmatic motion (autoscroll animations, anchor re-pins, inset changes). Only a
    /// user-driven phase may disengage bottom-following — a programmatic perturbation can only
    /// ever re-engage it — which structurally breaks every geometry→state→geometry feedback
    /// cycle: no chain of layout reactions can take the gate false and sustain itself.
+    ///
+    /// `.tracking` (finger down, no displacement yet) deliberately does NOT count: a finger
+    /// resting on the transcript scrolls nothing, but touching down *stops a live deceleration*,
+    /// and that stop emits a final far-from-bottom geometry reading under `.tracking`. Tapping
+    /// the chevron mid-deceleration raced exactly that emission against the tap's "follow again"
+    /// — when the stop reading landed after it, following disengaged right back and the chevron
+    /// stuck until a second tap. Real scroll-aways always pass through `.interacting`.
    @State private var scrollPhase: ScrollPhase = .idle
    private var isUserScrolling: Bool {
-        scrollPhase == .tracking || scrollPhase == .interacting || scrollPhase == .decelerating
+        scrollPhase == .interacting || scrollPhase == .decelerating
    }

    var body: some View {