fix: Fix json loading in gui

The loading was working to be able to use the JsonDocument API, but it
didn't work in the GUI to display the file.

This is fixed, and we update the underlying json model after each save.

src/core/jsondocument.cpp

@@ -103,6 +103,7 @@ bool JsonDocument::setValue(const QString &path, const QVariant &value)
     Utils::SetJsonValueStatus status = Utils::setJsonValue(m_jsonData, path, value);
     switch (status) {
     case Utils::SetJsonValueStatus::Success:
+        setText(QString::fromStdString(m_jsonData.dump(4, ' ', false)));
         return true;
     case Utils::SetJsonValueStatus::NullValue:
         spdlog::error("JsonDocument::setValue {} in {} - value is null", value.toString(), path);
@@ -117,22 +118,22 @@ bool JsonDocument::setValue(const QString &path, const QVariant &value)
 bool JsonDocument::doLoad(const QString &fileName)
 {
     Q_ASSERT(!fileName.isEmpty());
-    return loadJsonData(fileName);
+
+    if (TextDocument::doLoad(fileName)) {
+        return loadJsonData(fileName);
+    }
+    return false;
 }
 
 bool JsonDocument::doSave(const QString &fileName)
 {
     Q_ASSERT(!fileName.isEmpty());
 
-    QFile file(fileName);
-    if (!file.open(QIODevice::WriteOnly | QIODevice::Truncate)) {
-        spdlog::error("JsonDocument::doSave {}", fileName);
-        return false;
+    if (TextDocument::doSave(fileName)) {
+        loadJsonData(fileName);
+        return true;
     }
-
-    QTextStream stream(&file);
-    stream << QString::fromStdString(m_jsonData.dump(4, ' ', false));
-    return true;
+    return false;
 }
 
 } // namespace Core