Stop changing tooltip on state change.

packages/devtools_app/lib/src/screens/memory/panes/chart/chart_control_pane.dart

@@ -126,7 +126,7 @@ class _LegendButton extends StatelessWidget {
         },
         icon: legendVisible ? Icons.close : Icons.storage,
         label: 'Legend',
-        tooltip: 'Show chart legend',
+        tooltip: 'Toggle visibility of the chart legend',
         minScreenWidthForTextBeforeScaling: memoryControlsMinVerboseWidth,
       ),
     );

packages/devtools_app/lib/src/screens/memory/panes/control/primary_controls.dart

@@ -15,10 +15,12 @@ class PrimaryControls extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
-    return ChartVisibilityButton(
-      showChart: preferences.memory.showChart,
+    return VisibilityButton(
+      show: preferences.memory.showChart,
       onPressed: (show) => preferences.memory.showChart.value = show,
       minScreenWidthForTextBeforeScaling: memoryControlsMinVerboseWidth,
+      label: 'Memory chart',
+      tooltip: 'Toggle visibility of the Memory usage chart',
     );
   }
 }

packages/devtools_app/lib/src/screens/performance/performance_screen.dart

@@ -199,12 +199,12 @@ class _PrimaryControls extends StatelessWidget {
     return Row(
       children: [
         if (serviceManager.connectedApp!.isFlutterAppNow!) ...[
-          ChartVisibilityButton(
-            showChart:
-                controller.flutterFramesController.showFlutterFramesChart,
+          VisibilityButton(
+            show: controller.flutterFramesController.showFlutterFramesChart,
             onPressed:
                 controller.flutterFramesController.toggleShowFlutterFrames,
             label: 'Flutter frames',
+            tooltip: 'Toggle visibility of the Flutter frames',
           ),
           const SizedBox(width: denseSpacing),
         ],

packages/devtools_app/lib/src/shared/common_widgets.dart

@@ -511,30 +511,33 @@ class CollapseAllButton extends StatelessWidget {
 ///
 /// The button automatically toggles the icon and the tooltip to indicate the
 /// shown or hidden state.
-class ChartVisibilityButton extends StatelessWidget {
-  const ChartVisibilityButton({
-    required this.showChart,
+class VisibilityButton extends StatelessWidget {
+  const VisibilityButton({
+    required this.show,
     required this.onPressed,
     this.minScreenWidthForTextBeforeScaling,
-    this.label = 'Chart',
+    required this.label,
+    required this.tooltip,
   });
 
-  final ValueListenable<bool> showChart;
+  final ValueListenable<bool> show;
 
   final void Function(bool) onPressed;
 
   final double? minScreenWidthForTextBeforeScaling;
 
   final String label;
 
+  final String tooltip;
+
   @override
   Widget build(BuildContext context) {
     return ValueListenableBuilder<bool>(
-      valueListenable: showChart,
+      valueListenable: show,
       builder: (_, show, __) {
         return IconLabelButton(
           key: key,
-          tooltip: show ? 'Hide chart' : 'Show chart',
+          tooltip: tooltip,
           icon: show ? Icons.keyboard_arrow_up : Icons.keyboard_arrow_down,
           label: label,
           minScreenWidthForTextBeforeScaling:

packages/devtools_app/test/performance/performance_screen_test.dart

@@ -104,7 +104,7 @@ void main() {
           find.text('Select a frame above to view analysis data.'),
           findsOneWidget,
         );
-        expect(find.byType(ChartVisibilityButton), findsOneWidget);
+        expect(find.byType(VisibilityButton), findsOneWidget);
         expect(find.byIcon(Icons.block), findsOneWidget);
         expect(find.text('Performance Overlay'), findsOneWidget);
         expect(find.text('Enhance Tracing'), findsOneWidget);
@@ -133,7 +133,7 @@ void main() {
           findsNothing,
         );
         expect(find.byType(EventDetails), findsOneWidget);
-        expect(find.byType(ChartVisibilityButton), findsNothing);
+        expect(find.byType(VisibilityButton), findsNothing);
         expect(find.byIcon(Icons.block), findsOneWidget);
         expect(find.text('Performance Overlay'), findsNothing);
         expect(find.text('Enhance Tracing'), findsNothing);
@@ -157,7 +157,7 @@ void main() {
           await pumpPerformanceScreen(tester, runAsync: true);
           await tester.pumpAndSettle();
 
-          final chartButtonFinder = find.byType(ChartVisibilityButton);
+          final chartButtonFinder = find.byType(VisibilityButton);
           expect(chartButtonFinder, findsOneWidget);
 
           // The flutter frames chart is visible.