#3316 fix: more building with Qt 6.10+

Signed-off-by: Patrizio Bekerle <patrizio@bekerle.com>

Author: pbek

src/dialogs/updatedialog.cpp

@@ -352,7 +352,11 @@ bool UpdateDialog::initializeMacOSUpdateProcess(const QString &releaseUrl) {
     }
 
     // read the content of the updater script
-    f.open(QFile::ReadOnly | QFile::Text);
+    if (!f.open(QFile::ReadOnly | QFile::Text)) {
+        qWarning() << "Failed to open file:" << f.fileName();
+        return false;
+    }
+
     QTextStream ts(&f);
     QString scriptContent = ts.readAll();
     f.close();

src/entities/note.cpp

@@ -4004,7 +4004,11 @@ bool Note::scaleDownImageFileIfNeeded(QFile &file) {
     const QPixmap &pixmap = QPixmap::fromImage(
         image.scaled(width, height, Qt::KeepAspectRatio, Qt::SmoothTransformation));
 
-    file.open(QIODevice::WriteOnly);
+    if (!file.open(QIODevice::WriteOnly)) {
+        qWarning() << "Failed to open file for writing:" << file.fileName();
+        return false;
+    }
+
     pixmap.save(&file);
     file.close();
 

src/mainwindow.cpp

@@ -1552,10 +1552,12 @@ void MainWindow::initStyling() {
         QFile f(QStringLiteral(":qdarkstyle/style.qss"));
         if (!f.exists()) {
             qWarning("Unable to set stylesheet, file not found!");
+        } else if (!f.open(QFile::ReadOnly | QFile::Text)) {
+            qWarning() << "Failed to open file:" << f.fileName();
         } else {
-            f.open(QFile::ReadOnly | QFile::Text);
             QTextStream ts(&f);
             appStyleSheet = ts.readAll();
+            f.close();
         }
 
         // QTextEdit background color of qdarkstyle