adding some tests of the editor

Author: grantnelson-wf

playground/internal/editor/editor_test.go

@@ -934,16 +934,6 @@ func Test_Editor_ProcessKeyDown_CommentToggle(t *testing.T) {
 		wantSelectionEnd:   48, // before last added `// `s
 		wantPrefentDefault: true,
 	})
-
-	runKeyDownTest(t, testKeyDown{
-		name:               `only blank lines`,
-		code:               "\n\n\n",
-		key:                `/`,
-		ctrl:               true,
-		selectionStart:     0,
-		selectionEnd:       3,
-		wantPrefentDefault: true,
-	})
 }
 
 func Test_Editor_ProcessKeyDown_Callback(t *testing.T) {

playground/internal/react/codeBox.go

@@ -84,6 +84,10 @@ func (cba *codeBoxAssistant) SetCode(code string) { cba.setCode(code) }
 func (cba *codeBoxAssistant) EmitSave()           { cba.onSave() }
 func (cba *codeBoxAssistant) EmitEscape()         { cba.onEscape() }
 
+// TODO(grantnelson-wf): Implement undo/redo stack since textarea
+// only handles undo/redo itself for non-programmatic changes but
+// doesn't handle undo/redo for when setCode is called.
+
 func (cba *codeBoxAssistant) onInput(e *js.Object) {
 	cba.setCode(e.Get(`target`).Get(`value`).String())
 }