Update RenderContentProxyBox double get preferredLineHeight

lib/src/widgets/box.dart

@@ -2,8 +2,16 @@ import 'package:flutter/rendering.dart';
 
 import '../models/documents/nodes/container.dart';
 
+/// A common interface to render boxes which represent a piece of rich text
+/// content.
+///
+/// See also:
+///   * [RenderParagraphProxy] implementation of this interface which wraps
+///     built-in [RenderParagraph]
+///   * [RenderEmbedProxy] implementation of this interface which wraps
+///     an arbitrary render box representing an embeddable object.
 abstract class RenderContentProxyBox implements RenderBox {
-  double getPreferredLineHeight();
+  double get preferredLineHeight;
 
   Offset getOffsetForCaret(TextPosition position, Rect? caretPrototype);
 

lib/src/widgets/proxy.dart

@@ -123,9 +123,7 @@ class RenderEmbedProxy extends RenderProxyBox implements RenderContentProxyBox {
       const TextRange(start: 0, end: 1);
 
   @override
-  double getPreferredLineHeight() {
-    return size.height;
-  }
+  double get preferredLineHeight => size.height;
 }
 
 class RichTextProxy extends SingleChildRenderObjectWidget {
@@ -274,9 +272,7 @@ class RenderParagraphProxy extends RenderProxyBox
   RenderParagraph? get child => super.child as RenderParagraph?;
 
   @override
-  double getPreferredLineHeight() {
-    return _prototypePainter.preferredLineHeight;
-  }
+  double get preferredLineHeight => _prototypePainter.preferredLineHeight;
 
   @override
   Offset getOffsetForCaret(TextPosition position, Rect? caretPrototype) =>

lib/src/widgets/text_line.dart

@@ -835,7 +835,7 @@ class RenderEditableTextLine extends RenderEditableBox {
 
   @override
   double preferredLineHeight(TextPosition position) {
-    return _body!.getPreferredLineHeight();
+    return _body!.preferredLineHeight;
   }
 
   @override