Update for Flutter 3.10 beta (#1746)

## Pre-launch Checklist

- [x] I read the [Flutter Style Guide] _recently_, and have followed its
advice.
- [x] I signed the [CLA].
- [x] I read the [Contributors Guide].
- [x] I updated/added relevant documentation (doc comments with `///`).
- [ ] All existing and new tests are passing.

---------

Co-authored-by: David Iglesias <ditman@gmail.com>
Co-authored-by: Mark Thompson <2554588+MarkTechson@users.noreply.github.com>
Co-authored-by: John Ryan <ryjohn@google.com>

simplistic_editor/lib/basic_text_field.dart

@@ -115,24 +115,19 @@ class _BasicTextFieldState extends State<BasicTextField> {
       case TargetPlatform.iOS:
         // ignore: deprecated_member_use
         _textSelectionControls = cupertinoTextSelectionHandleControls;
-        break;
       case TargetPlatform.macOS:
         // ignore: deprecated_member_use
         _textSelectionControls = cupertinoDesktopTextSelectionHandleControls;
-        break;
       case TargetPlatform.android:
       case TargetPlatform.fuchsia:
         // ignore: deprecated_member_use
         _textSelectionControls = materialTextSelectionHandleControls;
-        break;
       case TargetPlatform.linux:
         // ignore: deprecated_member_use
         _textSelectionControls = desktopTextSelectionHandleControls;
-        break;
       case TargetPlatform.windows:
         // ignore: deprecated_member_use
         _textSelectionControls = desktopTextSelectionHandleControls;
-        break;
     }
 
     return TextFieldTapRegion(
@@ -164,7 +159,6 @@ class _BasicTextFieldState extends State<BasicTextField> {
                 from: longPressMoveUpdateDetails.globalPosition,
                 cause: SelectionChangedCause.longPress,
               );
-              break;
             case TargetPlatform.android:
             case TargetPlatform.fuchsia:
             case TargetPlatform.linux:
@@ -175,7 +169,6 @@ class _BasicTextFieldState extends State<BasicTextField> {
                 to: longPressMoveUpdateDetails.globalPosition,
                 cause: SelectionChangedCause.longPress,
               );
-              break;
           }
         },
         onLongPressEnd: (longPressEndDetails) =>

simplistic_editor/lib/basic_text_input_client.dart

@@ -585,7 +585,6 @@ class BasicTextInputClientState extends State<BasicTextInputClient>
             ),
             cause,
           );
-          break;
       }
       hideToolbar();
     }
@@ -759,12 +758,10 @@ class BasicTextInputClientState extends State<BasicTextInputClient>
       case SelectionChangedCause.tap:
       case SelectionChangedCause.toolbar:
         requestKeyboard();
-        break;
       case SelectionChangedCause.keyboard:
         if (_hasFocus) {
           requestKeyboard();
         }
-        break;
     }
     if (widget.selectionControls == null && widget.contextMenuBuilder == null) {
       _selectionOverlay?.dispose();

simplistic_editor/lib/text_editing_delta_history_view.dart

@@ -164,16 +164,12 @@ class TextEditingDeltaView extends StatelessWidget {
     switch (deltaType) {
       case 'Insertion':
         rowColor = Colors.greenAccent.shade100;
-        break;
       case 'Deletion':
         rowColor = Colors.redAccent.shade100;
-        break;
       case 'Replacement':
         rowColor = Colors.yellowAccent.shade100;
-        break;
       case 'NonTextUpdate':
         rowColor = Colors.blueAccent.shade100;
-        break;
       default:
         rowColor = Colors.white;
     }

simplistic_editor/pubspec.yaml

@@ -18,7 +18,7 @@ publish_to: 'none' # Remove this line if you wish to publish to pub.dev
 version: 1.0.0+1
 
 environment:
-  sdk: '>=2.19.5 <4.0.0'
+  sdk: ^3.0.0-0
 
 # Dependencies specify other packages that your package needs in order to work.
 # To automatically upgrade your package dependencies to the latest versions