Add regression tests for issues that are fixed now.

(Most were fixed by #1687, but some were already better.)

Close #900 (!).
Close #1525.
Close #1526.
Close #1603.
Close #1685.

Author: munificent

test/tall/regression/0900/0900.stmt

@@ -1,4 +1,27 @@
 >>>
+final commonParameters = constructrorsNeedsGeneration
+    .first.parameters.allParameters
+    .where((parameter) {
+  return constructrorsNeedsGeneration.every((constructor) {
+    return constructor.parameters.allParameters.any((p) {
+      return p.name == parameter.name && p.type == parameter.type;
+    });
+  });
+}).toList();
+<<<
+final commonParameters = constructrorsNeedsGeneration
+    .first
+    .parameters
+    .allParameters
+    .where((parameter) {
+      return constructrorsNeedsGeneration.every((constructor) {
+        return constructor.parameters.allParameters.any((p) {
+          return p.name == parameter.name && p.type == parameter.type;
+        });
+      });
+    })
+    .toList();
+>>>
 void main() {
   final f = stdin.readLineSync,
       p = int.parse,

test/tall/regression/1500/1525.stmt

@@ -0,0 +1,38 @@
+>>>
+SomeWidget(
+  children: [
+    long,
+    list,
+    literal, // Force split.
+  ],
+);
+<<<
+SomeWidget(
+  children: [
+    long,
+    list,
+    literal, // Force split.
+  ],
+);
+>>>
+SomeWidget(children: [
+  for (final o in objects) o, // Force split.
+]);
+<<<
+SomeWidget(
+  children: [
+    for (final o in objects) o, // Force split.
+  ],
+);
+>>>
+map((innerMap) => innerMap..addAll({
+  'something': someMap['something'],
+  //...
+}));
+<<<
+map(
+  (innerMap) => innerMap..addAll({
+    'something': someMap['something'],
+    //...
+  }),
+);

test/tall/regression/1500/1526.stmt

@@ -39,4 +39,28 @@
           'nameStartsWith': cleanNameFilter,
       },
       cancelToken: cancelToken,
-    );
+    );
+>>> (indent 2)
+  final content = json.decode(
+    await rootBundle.loadString('assets/configurations.json'),
+  ) as Map<String, Object?>;
+<<<
+  final content =
+      json.decode(await rootBundle.loadString('assets/configurations.json'))
+          as Map<String, Object?>;
+>>> (indent 4)
+    final results =
+        annotationsOf(element, throwOnUnresolved: throwOnUnresolved);
+<<<
+    final results = annotationsOf(
+      element,
+      throwOnUnresolved: throwOnUnresolved,
+    );
+>>> (indent 8)
+        final newListeners =
+            List<_Listener<T>?>.filled(_listeners.length * 2, null);
+<<<
+        final newListeners = List<_Listener<T>?>.filled(
+          _listeners.length * 2,
+          null,
+        );

test/tall/regression/1500/1526.unit

@@ -0,0 +1,14 @@
+>>>
+@freezed
+class CharacterOffset with _$CharacterOffset {
+  factory CharacterOffset({
+    required int offset,
+    @Default('') String name,
+  }) = _CharacterOffset;
+}
+<<<
+@freezed
+class CharacterOffset with _$CharacterOffset {
+  factory CharacterOffset({required int offset, @Default('') String name}) =
+      _CharacterOffset;
+}

test/tall/regression/1600/1603.stmt

@@ -0,0 +1,26 @@
+>>> (indent 6)
+      final value = Value((b) => b
+        ..anInt = 3
+        ..aString = 'four');
+<<<
+      final value = Value(
+        (b) => b
+          ..anInt = 3
+          ..aString = 'four',
+      );
+>>>
+final value = Value((b) {
+  b
+    ..anInt = 3
+    ..aString = 'four';
+});
+<<<
+final value = Value((b) {
+  b
+    ..anInt = 3
+    ..aString = 'four';
+});
+>>> (indent 4)
+    print((b) => b..x = 3);
+<<<
+    print((b) => b..x = 3);

test/tall/regression/1600/1685.stmt

@@ -0,0 +1,37 @@
+>>>
+final x =
+    true
+        ? foo(
+          aaaaaaaaaaaaaa: 4,
+          bbbbbbbbbbbbbbb: 6,
+          ccccccccccccccc: 0,
+          dddddddddddddddddd: 3,
+          eeeeeeeeeeeeeeeeeee: 3,
+          ffffffffffffffffff: 1,
+        )
+        : foo(
+          aaaaaaaaaaaaaa: 1,
+          bbbbbbbbbbbbbbb: 2,
+          ccccccccccccccc: 0,
+          dddddddddddddddddd: 6,
+          eeeeeeeeeeeeeeeeeee: 3,
+          ffffffffffffffffff: 4,
+        );
+<<<
+final x = true
+    ? foo(
+        aaaaaaaaaaaaaa: 4,
+        bbbbbbbbbbbbbbb: 6,
+        ccccccccccccccc: 0,
+        dddddddddddddddddd: 3,
+        eeeeeeeeeeeeeeeeeee: 3,
+        ffffffffffffffffff: 1,
+      )
+    : foo(
+        aaaaaaaaaaaaaa: 1,
+        bbbbbbbbbbbbbbb: 2,
+        ccccccccccccccc: 0,
+        dddddddddddddddddd: 6,
+        eeeeeeeeeeeeeeeeeee: 3,
+        ffffffffffffffffff: 4,
+      );