Add a EdgeInsetsDirectional.all constructor similar to EdgeInsets.all (#76542)

packages/flutter/lib/src/painting/edge_insets.dart

@@ -663,6 +663,22 @@ class EdgeInsetsDirectional extends EdgeInsetsGeometry {
     this.bottom = 0.0,
   });
 
+  /// Creates insets where all the offsets are `value`.
+  ///
+  /// {@tool snippet}
+  ///
+  /// Typical eight-pixel margin on all sides:
+  ///
+  /// ```dart
+  /// const EdgeInsetsDirectional.all(8.0)
+  /// ```
+  /// {@end-tool}
+  const EdgeInsetsDirectional.all(double value)
+    : start = value,
+      top = value,
+      end = value,
+      bottom = value;
+
   /// An [EdgeInsetsDirectional] with zero offsets in each direction.
   ///
   /// Consider using [EdgeInsets.zero] instead, since that object has the same

packages/flutter/test/painting/edge_insets_test.dart

@@ -54,6 +54,8 @@ void main() {
   test('EdgeInsets.resolve()', () {
     expect(const EdgeInsetsDirectional.fromSTEB(10.0, 20.0, 30.0, 40.0).resolve(TextDirection.ltr), const EdgeInsets.fromLTRB(10.0, 20.0, 30.0, 40.0));
     expect(const EdgeInsetsDirectional.fromSTEB(99.0, 98.0, 97.0, 96.0).resolve(TextDirection.rtl), const EdgeInsets.fromLTRB(97.0, 98.0, 99.0, 96.0));
+    expect(const EdgeInsetsDirectional.all(50.0).resolve(TextDirection.ltr), const EdgeInsets.fromLTRB(50.0, 50.0, 50.0, 50.0));
+    expect(const EdgeInsetsDirectional.all(50.0).resolve(TextDirection.rtl), const EdgeInsets.fromLTRB(50.0, 50.0, 50.0, 50.0));
     expect(const EdgeInsetsDirectional.only(start: 963.25).resolve(TextDirection.ltr), const EdgeInsets.fromLTRB(963.25, 0.0, 0.0, 0.0));
     expect(const EdgeInsetsDirectional.only(top: 963.25).resolve(TextDirection.ltr), const EdgeInsets.fromLTRB(0.0, 963.25, 0.0, 0.0));
     expect(const EdgeInsetsDirectional.only(end: 963.25).resolve(TextDirection.ltr), const EdgeInsets.fromLTRB(0.0, 0.0, 963.25, 0.0));