qt6: Build with mingw as well in CI to avoid accidentally breaking mingw build

.github/workflows/ci.yml

@@ -179,8 +179,8 @@ jobs:
           path: out/Seamly2D-macos.zip
           if-no-files-found: error
 
-  windows:
-    name: 'Windows: Build'
+  windows-msvc:
+    name: 'Windows: Build with msvc'
     runs-on: windows-latest
     needs: version
     env:
@@ -248,10 +248,71 @@ jobs:
           path: Seamly2D-windows.zip
           if-no-files-found: error
 
+  windows-mingw:
+    name: 'Windows: Build with mingw'
+    runs-on: windows-latest
+    needs: version
+    env:
+      VERSION_NUMBER: ${{ needs.version.outputs.version_number }}
+
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Remove preinstalled mingw
+        # we use the same mingw from Qt tools instead of the github actions hosted runner one, so that its as close as possible to developer setup
+        # in addition, the code was not compiling with the provided one and just failing with a nondescript "error 1"
+        shell: bash
+        run: |
+          choco uninstall mingw -y
+
+      - uses: jurplel/install-qt-action@v3
+        with:
+          version: ${{ env.QT_VERSION }}
+          cache: true
+          arch: win64_mingw
+          modules: qt5compat qtmultimedia
+          tools: tools_mingw90
+
+      - name: update version
+        shell: bash
+        run: |
+          ./scripts/version.sh ${VERSION_NUMBER}
+
+      - name: make seamly2d.exe and seamlyme.exe
+        shell: bash
+        # we use the same mingw from Qt tools so that its as close as possible to developer setup
+        run: |
+          export "PATH=/d/a/Seamly2D/Qt/Tools/mingw1120_64/bin:$PATH"
+          qmake.exe Seamly2D.pro -config release CONFIG+=noTests
+          mingw32-make -j2
+
+      - name: create seamly2d-installer.exe
+        # copy seamly2d and seamlyme directory trees prepared by windeployqt and create installer
+        # uses parameters in seamly2d-installer.nsi to create the installer exe
+        run: |
+          mkdir ..\windows-build
+          Copy-Item -Path 'src\app\seamly2d\bin\*' -Destination ..\windows-build -Recurse
+          Copy-Item -Path 'src\app\seamlyme\bin\*' -Destination ..\windows-build -Recurse -Force
+          Copy-Item -Path dist\seamly2d-installer.nsi -Destination ..\windows-build
+          cd ..\windows-build\
+          & 'C:\Program Files (x86)\NSIS\makensis.exe' seamly2d-installer.nsi
+
+      - name: pack installer file into .zip
+        run: |
+          cd ..\windows-build\
+          C:\"Program Files"\7-Zip\7z.exe a Seamly2D-windows-mingw.zip Seamly2D-installer.exe
+          copy Seamly2D-windows-mingw.zip ..\Seamly2D\
+
+      - uses: actions/upload-artifact@v3
+        with:
+          name: Seamly2D-windows-mingw.zip
+          path: Seamly2D-windows-mingw.zip
+          if-no-files-found: error
+
   publish:
     if: false
     runs-on: ubuntu-latest
-    needs: [version, windows, linux, macos]
+    needs: [version, windows-msvc, linux, macos]
     env:
       VERSION_NUMBER: ${{ needs.version.outputs.version_number }}
 

src/app/seamly2d/core/vapplication.cpp

@@ -75,6 +75,9 @@
 #include <QThread>
 #include <QDateTime>
 #include <QIcon>
+#include <QJsonObject>
+#include <QJsonValue>
+#include <QJsonDocument>
 
 QT_WARNING_PUSH
 QT_WARNING_DISABLE_CLANG("-Wmissing-prototypes")