Fix bug #77996

Don't allow to insert other forms inside a fixed labeled checkbox

api.js

@@ -493,7 +493,17 @@ window["AscOForm"] = window.AscOForm = AscOForm;
 		if (!form || !form.IsForm())
 			return;
 		
-		return this.private_SetFormValue(form.GetId(), value);
+		if (typeof(value) === "string")
+		{
+			let _t = this;
+			AscFonts.FontPickerByCharacter.checkText(value, this, function() {
+				_t.private_SetFormValue(form.GetId(), value);
+			});
+		}
+		else
+		{
+			this.private_SetFormValue(form.GetId(), value);
+		}
 	};
 	window['Asc']['asc_docs_api'].prototype['asc_GetFormValue'] = window['Asc']['asc_docs_api'].prototype.asc_GetFormValue = function(formId)
 	{
@@ -727,6 +737,10 @@ window["AscOForm"] = window.AscOForm = AscOForm;
 	{
 		let form = logicDocument.GetContentControl();
 		
+		let mainForm = form ? form.GetMainForm() : null;
+		if (mainForm && mainForm.IsLabeledCheckBox())
+			return mainForm.MoveCursorOutsideForm(false);
+		
 		if (!form || !form.IsForm() || (form.IsComplexForm() && !isComplex))
 			return;