Use precisionErrorTolerance (#32499)

dev/integration_tests/android_views/lib/motion_event_diff.dart

@@ -3,6 +3,7 @@
 // found in the LICENSE file.
 
 import 'package:collection/collection.dart';
+import 'package:flutter/foundation.dart';
 
 // Android MotionEvent actions for which a pointer index is encoded in the
 // unmasked action code.
@@ -13,7 +14,7 @@ const List<int> kPointerActions = <int>[
   6, // POINTER_UP
 ];
 
-const double kDoubleErrorMargin = 0.0001;
+const double kDoubleErrorMargin = precisionErrorTolerance;
 
 String diffMotionEvents(
   Map<String, dynamic> originalEvent,

dev/tools/vitool/test/vitool_test.dart

@@ -5,6 +5,7 @@
 import 'dart:math';
 
 import 'package:collection/collection.dart';
+import 'package:flutter/foundation.dart';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:vitool/vitool.dart';
 import 'package:path/path.dart' as path;
@@ -146,7 +147,7 @@ void main() {
               SvgPathCommand('M', <Point<double>>[Point<double>(19.0, 0.0)]),
               SvgPathCommand('Z', <Point<double>>[]),
             ]),
-            margin: 0.000000001
+            margin: precisionErrorTolerance,
         )
       ]);
     });

packages/flutter/lib/src/gestures/lsq_solver.dart

@@ -5,6 +5,8 @@
 import 'dart:math' as math;
 import 'dart:typed_data';
 
+import 'package:flutter/foundation.dart';
+
 // TODO(abarth): Consider using vector_math.
 class _Vector {
   _Vector(int size)
@@ -128,7 +130,7 @@ class LeastSquaresSolver {
       }
 
       final double norm = q.getRow(j).norm();
-      if (norm < 0.000001) {
+      if (norm < precisionErrorTolerance) {
         // Vectors are linearly dependent or zero so no solution.
         return null;
       }
@@ -176,7 +178,7 @@ class LeastSquaresSolver {
       sumSquaredTotal += w[h] * w[h] * v * v;
     }
 
-    result.confidence = sumSquaredTotal <= 0.000001 ? 1.0 :
+    result.confidence = sumSquaredTotal <= precisionErrorTolerance ? 1.0 :
                           1.0 - (sumSquaredError / sumSquaredTotal);
 
     return result;

packages/flutter/lib/src/rendering/table.dart

@@ -918,7 +918,7 @@ class RenderTable extends RenderBox {
       int availableColumns = columns;
       // Handle double precision errors which causes this loop to become
       // stuck in certain configurations.
-      const double minimumDeficit = 0.00000001;
+      const double minimumDeficit = precisionErrorTolerance;
       while (deficit > minimumDeficit && totalFlex > minimumDeficit) {
         double newTotalFlex = 0.0;
         for (int x = 0; x < columns; x += 1) {

packages/flutter/test/cupertino/dialog_test.dart

@@ -654,13 +654,10 @@ void main() {
     expect(option1ButtonBox.size.width, actionsSectionBox.size.width);
 
     // Expected Height = button 1 + divider + 1/2 button 2 = 67.83333333333334
-    // Technically the following number is off by 0.00000000000003 but I think it's a
-    // Dart precision issue. I ran the subtraction directly in dartpad and still
-    // got 67.83333333333337.
-    const double expectedHeight = 67.83333333333337;
+    const double expectedHeight = 67.83333333333334;
     expect(
       actionsSectionBox.size.height,
-      expectedHeight,
+      moreOrLessEquals(expectedHeight),
     );
   });
 

packages/flutter/test/cupertino/nav_bar_transition_test.dart

@@ -119,7 +119,7 @@ void checkOpacity(WidgetTester tester, Finder finder, double opacity) {
         matching: find.byType(FadeTransition),
       ),
     ).opacity.value,
-    moreOrLessEquals(opacity, epsilon: 0.000000001),
+    moreOrLessEquals(opacity),
   );
 }
 

packages/flutter/test/widgets/scroll_simulation_test.dart

@@ -9,8 +9,8 @@ void main() {
   test('ClampingScrollSimulation has a stable initial conditions', () {
     void checkInitialConditions(double position, double velocity) {
       final ClampingScrollSimulation simulation = ClampingScrollSimulation(position: position, velocity: velocity);
-      expect(simulation.x(0.0), closeTo(position, 0.00001));
-      expect(simulation.dx(0.0), closeTo(velocity, 0.00001));
+      expect(simulation.x(0.0), moreOrLessEquals(position));
+      expect(simulation.dx(0.0), moreOrLessEquals(velocity));
     }
 
     checkInitialConditions(51.0, 2866.91537);