Refactoring. Avoid using continue and locally defined functions.

src/model/schema.js

@@ -735,30 +735,20 @@ export default class Schema {
 		for ( const node of nodes ) {
 			// When node is a `Text` it has no children, so just filter it out.
 			if ( node.is( 'text' ) ) {
-				removeDisallowedAttributeFromNode( this, node );
-
-				continue;
+				removeDisallowedAttributeFromNode( this, node, writer );
 			}
-
 			// In a case of `Element` iterates through positions between nodes inside this element
 			// and filter out node before the current position, or position parent when position
 			// is at start of an element. Using positions prevent from omitting merged nodes
 			// see https://github.com/ckeditor/ckeditor5-engine/issues/1789.
+			else {
+				const rangeInNode = Range._createIn( node );
+				const positionsInRange = rangeInNode.getPositions();
 
-			const rangeInNode = Range._createIn( node );
-			const positionsInRange = rangeInNode.getPositions();
-
-			for ( const position of positionsInRange ) {
-				const item = position.nodeBefore || position.parent;
-
-				removeDisallowedAttributeFromNode( this, item );
-			}
-		}
+				for ( const position of positionsInRange ) {
+					const item = position.nodeBefore || position.parent;
 
-		function removeDisallowedAttributeFromNode( schema, node ) {
-			for ( const attribute of node.getAttributeKeys() ) {
-				if ( !schema.checkAttribute( node, attribute ) ) {
-					writer.removeAttribute( attribute, node );
+					removeDisallowedAttributeFromNode( this, item, writer );
 				}
 			}
 		}
@@ -1611,3 +1601,11 @@ function* convertToMinimalFlatRanges( ranges ) {
 		yield* range.getMinimalFlatRanges();
 	}
 }
+
+function removeDisallowedAttributeFromNode( schema, node, writer ) {
+	for ( const attribute of node.getAttributeKeys() ) {
+		if ( !schema.checkAttribute( node, attribute ) ) {
+			writer.removeAttribute( attribute, node );
+		}
+	}
+}