try lint avoid_unused_constructor_parameters (flutter#13250)

Author: a14n

analysis_options.yaml

@@ -70,7 +70,7 @@ linter:
     # - avoid_setters_without_getters # not yet tested
     - avoid_slow_async_io
     # - avoid_types_on_closure_parameters # conflicts with always_specify_types
-    # - avoid_unused_constructor_parameters # not yet tested
+    # - avoid_unused_constructor_parameters # https://github.com/dart-lang/linter/pull/847
     - await_only_futures
     - camel_case_types
     - cancel_subscriptions

analysis_options_repo.yaml

@@ -63,7 +63,7 @@ linter:
     # - avoid_setters_without_getters # not yet tested
     - avoid_slow_async_io
     # - avoid_types_on_closure_parameters # conflicts with always_specify_types
-    # - avoid_unused_constructor_parameters # not yet tested
+    # - avoid_unused_constructor_parameters # https://github.com/dart-lang/linter/pull/847
     - await_only_futures
     - camel_case_types
     - cancel_subscriptions

packages/flutter/lib/src/foundation/diagnostics.dart

@@ -1955,7 +1955,6 @@ class DiagnosticableNode<T extends Diagnosticable> extends DiagnosticsNode {
     String name,
     @required this.value,
     @required DiagnosticsTreeStyle style,
-    String emptyBodyDescription,
   }) : assert(value != null),
        super(
          name: name,

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

@@ -127,6 +127,7 @@ class RenderEditable extends RenderBox {
        _showCursor = showCursor ?? new ValueNotifier<bool>(false),
        _hasFocus = hasFocus ?? false,
        _maxLines = maxLines,
+       _selectionColor = selectionColor,
        _selection = selection,
        _offset = offset {
     assert(_showCursor != null);