Show the iOS sheet grabber only on a sheet that can be resized

resources/ios/NativeUIBottomSheetRenderer.swift

@@ -56,7 +56,10 @@ struct NativeUIBottomSheetRenderer: View {
                     detents: resolveDetents(detentsStr),
                     selection: fits ? $selectedDetent : nil
                 ))
-                .presentationDragIndicator(.visible)
+                // The system shows the grabber only when the sheet can be
+                // resized, as Apple's HIG has it. A single-detent sheet has
+                // nothing to drag between, so a grabber would only mislead.
+                .presentationDragIndicator(.automatic)
                 .interactiveDismissDisabled(permanent)
                 .presentationBackgroundInteraction(bgInteraction ? .enabled : .automatic)
                 .modifier(A11yLabelModifier(label: a11yLabel))

tests/BottomSheetRendererTest.php

@@ -1,5 +1,14 @@
 <?php
 
+test('leaves the iOS grabber to the system, so only a resizable sheet shows one', function () {
+    $renderer = file_get_contents(dirname(__DIR__).'/resources/ios/NativeUIBottomSheetRenderer.swift');
+
+    expect($renderer)
+        ->toBeString()
+        ->toMatch('/\.presentationDragIndicator\(\.automatic\)/')
+        ->not->toContain('.presentationDragIndicator(.visible)');
+});
+
 test('keeps the Android bottom sheet composed until hiding it has slid it away', function () {
     $rendererPath = dirname(__DIR__).'/resources/android/BottomSheetRenderer.kt';