fix: always detect format from content

README.md

@@ -7,3 +7,7 @@
  - For windows build, win32 APIs are used.
  - No license file provided.
  - No drag-window-border-to-resize support under non-windows platforms (I use <kbd>Meta+Drag</kbd> to resize window under my x11 desktop).
+
+## License
+
+This program released under MIT license

graphicsview.cpp

@@ -42,6 +42,7 @@ void GraphicsView::showFromUrlList(const QList<QUrl> &urlList)
         showGif(filePath);
     } else {
         QImageReader imageReader(filePath);
+        imageReader.setDecideFormatFromContent(true);
         QImage::Format imageFormat = imageReader.imageFormat();
         if (imageFormat == QImage::Format_Invalid) {
             showText(tr("File is not a valid image"));