Fix editor reveals cursor and widget when not focused (#569)

Author: Amir-P

packages/fleather/lib/src/widgets/editor.dart

@@ -1627,7 +1627,8 @@ class RawEditorState extends EditorState
   bool _showCaretOnScreenScheduled = false;
 
   void _showCaretOnScreen([bool withAnimation = true]) {
-    if (!widget.showCursor ||
+    if (!_hasFocus ||
+        !widget.showCursor ||
         !widget.enableInteractiveSelection ||
         _showCaretOnScreenScheduled) {
       return;

packages/fleather/test/widgets/editor_test.dart

@@ -1632,6 +1632,44 @@ void main() {
         await tester.pump(throttleDuration);
       });
 
+      testWidgets('does not reveal cursor or editor when not focused',
+          (tester) async {
+        final scrollController = ScrollController();
+        final controller = FleatherController();
+        final widget = MaterialApp(
+          home: SingleChildScrollView(
+            controller: scrollController,
+            child: SizedBox(
+              width: double.maxFinite,
+              child: Column(
+                crossAxisAlignment: CrossAxisAlignment.start,
+                children: [
+                  for (var i = 0; i < 20; i++) ...[
+                    FleatherField(
+                      key: Key('Field.Key.$i'),
+                      focusNode: FocusNode(),
+                      scrollable: false,
+                      autofocus: true,
+                      showCursor: true,
+                      autocorrect: false,
+                      enableSuggestions: false,
+                      controller: i == 15 ? controller : FleatherController(),
+                    )
+                  ]
+                ],
+              ),
+            ),
+          ),
+        );
+        await tester.pumpWidget(widget);
+        final initialScrollPosition = scrollController.position.pixels;
+        final newInput = 'Line1\nLine2';
+        controller.replaceText(0, 0, newInput,
+            selection: TextSelection.collapsed(offset: newInput.length));
+        await tester.pumpAndSettle(throttleDuration);
+        expect(scrollController.position.pixels, initialScrollPosition);
+      });
+
       testWidgets(
           'shows cursor on screen when not scrollable with scroll parent',
           (tester) async {