From aabe53ca36196d5e62a1e5c0965903b4290da637 Mon Sep 17 00:00:00 2001
From: zhengzeqin <zeqinjie@qq.com>
Date: Tue, 30 Apr 2024 02:18:06 +0800
Subject: [PATCH] [Fix]: showDateRangePicker with "large" helpText cutoffs the
 save button (#146049)

Fix https://github.com/flutter/flutter/issues/146039

Pre-launch Checklist
---
 packages/flutter/lib/src/material/date_picker.dart     |  7 ++++++-
 .../flutter/test/material/date_range_picker_test.dart  | 10 ++++++++++
 2 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/packages/flutter/lib/src/material/date_picker.dart b/packages/flutter/lib/src/material/date_picker.dart
index 890ae8d747..c2b907c4ef 100644
--- a/packages/flutter/lib/src/material/date_picker.dart
+++ b/packages/flutter/lib/src/material/date_picker.dart
@@ -1685,7 +1685,12 @@ class _CalendarRangePickerDialog extends StatelessWidget {
                   child: Column(
                     crossAxisAlignment: CrossAxisAlignment.start,
                     children: <Widget>[
-                      Text(helpText, style: headlineHelpStyle),
+                      Text(
+                        helpText,
+                        style: headlineHelpStyle,
+                        maxLines: 1,
+                        overflow: TextOverflow.ellipsis,
+                      ),
                       const SizedBox(height: 8),
                       Row(
                         children: <Widget>[
diff --git a/packages/flutter/test/material/date_range_picker_test.dart b/packages/flutter/test/material/date_range_picker_test.dart
index 0a62808319..6206f4ce50 100644
--- a/packages/flutter/test/material/date_range_picker_test.dart
+++ b/packages/flutter/test/material/date_range_picker_test.dart
@@ -268,6 +268,16 @@ void main() {
     });
   });
 
+  testWidgets('Long helpText does not cutoff the save button', (WidgetTester tester) async {
+    helpText = 'long helpText' * 100;
+    saveText = 'make it so';
+    await preparePicker(tester, (Future<DateTimeRange?> range) async {
+      expect(find.text(helpText!), findsOneWidget);
+      expect(find.text(saveText!), findsOneWidget);
+      expect(tester.takeException(), null);
+    });
+  });
+
   testWidgets('Material3 has sentence case labels', (WidgetTester tester) async {
     await preparePicker(tester, (Future<DateTimeRange?> range) async {
       expect(find.text('Save'), findsOneWidget);