test(cursor): clarify scale constraints and isolate DPR checks

flutter/lib/desktop/pages/remote_page.dart

@@ -1421,15 +1421,19 @@ class CursorPaint extends StatelessWidget {
 
     final image = m.image ?? preDefaultCursor.image;
     final nativePixels = isWindows ? MediaQuery.devicePixelRatioOf(context) : 1.0;
+    // Show remote cursor follows the image scale, independently of Zoom cursor.
     double scale = c.scale;
     if (image != null && scale * nativePixels != 1.0) {
       final sx = kMinCursorSize / (image.width * nativePixels);
       final sy = kMinCursorSize / (image.height * nativePixels);
+      // Preserve Original's short-edge minimum; scaled views use the long edge.
       final minimumScale = c.viewStyle.style == kRemoteViewStyleOriginal
           ? (sx > sy ? sx : sy)
           : (sx < sy ? sx : sy);
       if (scale < minimumScale) scale = minimumScale;
     }
+    // Keep the hotspot at the remote position even when the minimum enlarges
+    // the cursor; fractional coordinates must survive painting below.
     final x = (m.x * c.scale + cx) / scale - hotx;
     final y = (m.y * c.scale + cy) / scale - hoty;
 

flutter/test/cursor_dpi_policy_test.dart

@@ -211,7 +211,8 @@ Future<void> _checkPolicy(
 
 Future<void> _checkDprChange(
     TestFlutterView view, List<Map<dynamic, dynamic>> registrations) async {
-  final data = await _data(1, 'dpr-cache');
+  // Keep the scale above the minimum so only DPR invalidates the cache.
+  final data = await _data(2, 'dpr-cache');
   final canvas = _Canvas(1, style: kRemoteViewStyleAdaptive, scale: 1);
   final cursor = _Cursor(data, _FFI(canvas));
   for (final dpr in [2.0, 1.0]) {

flutter/test/cursor_web_test.dart

@@ -1,3 +1,6 @@
+// The test drives the cursor lifecycle normally owned by MouseTracker.
+// ignore_for_file: invalid_use_of_protected_member
+
 @TestOn('browser')
 library;