Windows: Update to Qt 6.8 and KDE Frameworks 6.12

Author: hluk

appveyor.yml

@@ -2,7 +2,7 @@
 configuration: Release
 
 image:
-  - Visual Studio 2019
+  - Visual Studio 2022
 
 cache:
   - usr
@@ -14,21 +14,22 @@ skip_branch_with_pr: true
 environment:
   APPVEYOR_SAVE_CACHE_ON_ERROR: true
 
-  KF_VERSION: 6.7
+  KF_VERSION: 6.12
   KF_BRANCH: stable
   KF_PATCH: 0
   SNORETOAST_VERSION: 0.9.0
 
   matrix:
-    - QTDIR: /c/Qt/6.5/msvc2019_64
-      CMAKE_GENERATOR: Visual Studio 16 2019
+    - QTDIR: /c/Qt/6.8/msvc2022_64
+      # https://cmake.org/cmake/help/latest/manual/cmake-generators.7.html#visual-studio-generators
+      CMAKE_GENERATOR: Visual Studio 17 2022
       CMAKE_GENERATOR_ARCH: x64
       BUILD_SUB_DIR: Release
-      # https://wiki.qt.io/Qt_6.5_Tools_and_Versions
+      # https://wiki.qt.io/Qt_6.8_Tools_and_Versions
       # https://www.appveyor.com/docs/windows-images-software/#tools
-      OPENSSL_PATH: /c/OpenSSL-v111-Win64/bin
-      LIBSSL: libssl-1_1-x64.dll
-      LIBCRYPTO: libcrypto-1_1-x64.dll
+      OPENSSL_PATH: /c/OpenSSL-v30-Win64/bin
+      LIBSSL: libssl-3-x64.dll
+      LIBCRYPTO: libcrypto-3-x64.dll
       GPGPATH: /c/Program Files/Git/usr/bin
       WITH_NATIVE_NOTIFICATIONS: "ON"
       WITH_QT6: "ON"

src/gui/theme.cpp

@@ -18,7 +18,7 @@
 #include <QStyleFactory>
 
 #if QT_VERSION >= QT_VERSION_CHECK(6,8,0)
-#include <QStyleHints>
+#   include <QStyleHints>
 #endif
 
 #include <cmath>