Qt: Fix Windows shared build

.appveyor.yml

@@ -12,7 +12,11 @@ install:
 - vcpkg --no-dry-run upgrade
 - rd /Q /S C:\Tools\vcpkg\buildtrees
 before_build:
-- cmake . -DCMAKE_PREFIX_PATH=C:\Qt\5.15\msvc2019_64 -DCMAKE_TOOLCHAIN_FILE=C:\Tools\vcpkg\scripts\buildsystems\vcpkg.cmake -DVCPKG_TARGET_TRIPLET=x64-windows-release -DCMAKE_CONFIGURATION_TYPES=Release
+- cmake . -DCMAKE_PREFIX_PATH=C:\Qt\5.15\msvc2019_64 \
+    -DCMAKE_TOOLCHAIN_FILE=C:\Tools\vcpkg\scripts\buildsystems\vcpkg.cmake \
+    -DVCPKG_TARGET_TRIPLET=x64-windows-release \
+    -DCMAKE_CONFIGURATION_TYPES=Release \
+    -DCMAKE_SYSTEM_VERSION=10.0.22000.1
 build:
   parallel: true
   project: mGBA.sln

CHANGES

@@ -52,6 +52,7 @@ Misc:
  - Qt: Remove maligned double-click-to-fullscreen shortcut (closes mgba.io/i/2632)
  - Qt: Pass logging context through to video proxy thread (fixes mgba.io/i/3095)
  - Qt: Show maker code and game version in ROM info
+ - Qt: Make window corners square on Windows 11 (fixes mgba.io/i/3285)
  - Res: Port NSO-gba-colors shader (closes mgba.io/i/2834)
  - Scripting: Add `callbacks:oneshot` for single-call callbacks
  - Switch: Add bilinear filtering option (closes mgba.io/i/3111)

src/platform/qt/CMakeLists.txt

@@ -427,6 +427,7 @@ set_target_properties(${BINARY_NAME}-qt PROPERTIES MACOSX_BUNDLE_INFO_PLIST ${PR
 
 if(WIN32)
 	set_target_properties(${BINARY_NAME}-qt PROPERTIES RUNTIME_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}")
+	target_link_libraries(${BINARY_NAME}-qt dwmapi)
 	if(NOT MSVC)
 		target_link_libraries(${BINARY_NAME}-qt -municode)
 	endif()
@@ -445,7 +446,7 @@ if(QT_STATIC)
 		if(CMAKE_CROSSCOMPILING)
 			set(QWINDOWS_DEPS ${QT}EventDispatcherSupport ${QT}FontDatabaseSupport ${QT}ThemeSupport ${QT}WindowsUIAutomationSupport)
 		endif()
-		list(APPEND QT_LIBRARIES ${QT}::QWindowsIntegrationPlugin ${QWINDOWS_DEPS} amstrmid dwmapi uxtheme imm32 -static-libgcc -static-libstdc++)
+		list(APPEND QT_LIBRARIES ${QT}::QWindowsIntegrationPlugin ${QWINDOWS_DEPS} amstrmid uxtheme imm32 -static-libgcc -static-libstdc++)
 		set_target_properties(${QT}::Core PROPERTIES INTERFACE_LINK_LIBRARIES "${QTPCRE};version;winmm;ssl;crypto;ws2_32;iphlpapi;crypt32;userenv;netapi32;wtsapi32")
 		set_target_properties(${QT}::Gui PROPERTIES INTERFACE_LINK_LIBRARIES ${OPENGL_LIBRARY} ${OPENGLES2_LIBRARY})
 	elseif(APPLE)

src/platform/qt/Window.cpp

@@ -14,6 +14,10 @@
 #include <QScreen>
 #include <QWindow>
 
+#ifdef Q_OS_WIN
+#include <dwmapi.h>
+#endif
+
 #ifdef USE_SQLITE3
 #include "ArchiveInspector.h"
 #include "library/LibraryController.h"
@@ -717,6 +721,11 @@ void Window::showEvent(QShowEvent* event) {
 		return;
 	}
 	m_wasOpened = true;
+#ifdef Q_OS_WIN
+	HWND hwnd = reinterpret_cast<HWND>(winId());
+	DWM_WINDOW_CORNER_PREFERENCE cornerPref = DWMWCP_DONOTROUND;
+	DwmSetWindowAttribute(hwnd, DWMWA_WINDOW_CORNER_PREFERENCE, &cornerPref, sizeof(cornerPref));
+#endif
 	if (m_initialSize.isValid()) {
 		resizeFrame(m_initialSize);
 	}