fix: visibilty bug

This commit adds an Alignment parameter to the visibility related methods.
The default setting by Flutter of Alignment.center fails, if hitting a SizedBox.
This can be fixed by specifying an Alignment.

packages/patrol_finders/lib/src/custom_finders/patrol_finder.dart

@@ -404,9 +404,13 @@ class PatrolFinder implements MatchFinder {
   ///
   /// Timeout is globally set by [PatrolTester.config.visibleTimeout]. If you
   /// want to override this global setting, set [timeout].
+  ///
+  /// Provide [alignment] to check if the widget is visible in a specific area
+  /// of the screen. It defaults to [Alignment.center].
   Future<PatrolFinder> waitUntilVisible({
     Duration? timeout,
     bool enablePatrolLog = true,
+    Alignment alignment = Alignment.center,
   }) =>
       wrapWithPatrolLog(
         action: 'waitUntilVisible',
@@ -415,6 +419,7 @@ class PatrolFinder implements MatchFinder {
           this,
           timeout: timeout,
           enablePatrolLog: false,
+          alignment: alignment,
         ),
         enablePatrolLog: enablePatrolLog,
       );
@@ -510,8 +515,11 @@ class PatrolFinder implements MatchFinder {
   String describeMatch(Plurality plurality) => finder.describeMatch(plurality);
 
   /// Returns true if this finder finds at least 1 visible widget.
-  bool get visible {
-    final isVisible = hitTestable().evaluate().isNotEmpty;
+  ///
+  /// Provide [alignment] to check if the widget is visible in a specific area
+  /// of the screen. It defaults to [Alignment.center].
+  bool visible({Alignment alignment = Alignment.center}) {
+    final isVisible = hitTestable(at: alignment).evaluate().isNotEmpty;
     if (isVisible == true) {
       assert(
         exists == true,

packages/patrol_finders/lib/src/custom_finders/patrol_tester.dart

@@ -489,10 +489,14 @@ class PatrolTester {
   ///
   /// Timeout is globally set by [PatrolTester.config.visibleTimeout]. If you
   /// want to override this global setting, set [timeout].
+  ///
+  /// Provide [alignment] to check if the widget is visible in a specific area
+  /// of the screen. It defaults to [Alignment.center].
   Future<PatrolFinder> waitUntilVisible(
     Finder finder, {
     Duration? timeout,
     bool enablePatrolLog = true,
+    Alignment alignment = Alignment.center,
   }) {
     return TestAsyncUtils.guard(
       () => wrapWithPatrolLog(
@@ -503,7 +507,7 @@ class PatrolTester {
         function: () async {
           final duration = timeout ?? config.visibleTimeout;
           final end = tester.binding.clock.now().add(duration);
-          final hitTestableFinder = finder.hitTestable();
+          final hitTestableFinder = finder.hitTestable(at: alignment);
           while (hitTestableFinder.evaluate().isEmpty) {
             final now = tester.binding.clock.now();
             if (now.isAfter(end)) {