Drop the back preview when the surface is shown again

components/src/main/kotlin/de/jeanlucmakiola/floret/components/CollapsingScaffold.kt

@@ -45,7 +45,9 @@ import de.jeanlucmakiola.floret.identity.predictiveBack
  * Optional extras, all defaulting to the bare scaffold so existing callers are
  * unchanged: [actions] adds trailing app-bar items; [snackbarHost] hosts
  * transient messages; [predictiveBack] (off by default) wires the gesture
- * preview to [onBack] for full-screen surfaces that want it.
+ * preview to [onBack] for full-screen surfaces that want it, with [visible]
+ * passed through to [Modifier.predictiveBack] for a surface that is shown and
+ * hidden in place.
  *
  * Set [scrollable] to false when [content] brings its own scrolling container.
  * The default column scrolls as a whole, which composes every row up front —
@@ -65,6 +67,7 @@ fun CollapsingScaffold(
     modifier: Modifier = Modifier,
     largeTopBar: Boolean = true,
     predictiveBack: Boolean = false,
+    visible: Boolean? = null,
     scrollable: Boolean = true,
     actions: @Composable RowScope.() -> Unit = {},
     snackbarHost: @Composable () -> Unit = {},
@@ -77,7 +80,7 @@ fun CollapsingScaffold(
     }
     Scaffold(
         modifier = modifier
-            .then(if (predictiveBack) Modifier.predictiveBack(onBack = onBack) else Modifier)
+            .then(if (predictiveBack) Modifier.predictiveBack(onBack = onBack, visible = visible) else Modifier)
             .fillMaxSize()
             .background(MaterialTheme.colorScheme.surface)
             .nestedScroll(scrollBehavior.nestedScrollConnection),