Fix Windows installer DLL bundling order

Run file(GET_RUNTIME_DEPENDENCIES) before windeployqt so the transitive
MinGW/Qt DLL closure resolves from a single path. Running windeployqt
first copied Qt6Core.dll into staging, causing "Multiple conflicting
paths" aborts. Also set CMP0207 to NEW and exclude SysWOW64.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

CMakeLists.txt

@@ -70,27 +70,48 @@ endif()
 install(TARGETS apart-controller RUNTIME DESTINATION .)
 
 if(WIN32)
-    # Run windeployqt at install time to gather Qt DLLs + plugins next to the exe.
-    find_program(WINDEPLOYQT_EXECUTABLE windeployqt
-        HINTS "${Qt6_DIR}/../../../bin" "${Qt6_DIR}/../../../../bin")
-    if(WINDEPLOYQT_EXECUTABLE)
-        install(CODE "
-            execute_process(COMMAND \"${WINDEPLOYQT_EXECUTABLE}\"
-                --release --no-translations --compiler-runtime
-                --dir \"\${CMAKE_INSTALL_PREFIX}\"
-                \"\${CMAKE_INSTALL_PREFIX}/apart-controller.exe\")
-        ")
-    else()
-        message(WARNING "windeployqt not found - Qt DLLs will not be auto-deployed.")
-    endif()
-
-    # MinGW runtime DLLs (windeployqt's --compiler-runtime often skips these).
     get_filename_component(_mingw_bin "${CMAKE_CXX_COMPILER}" DIRECTORY)
-    foreach(_dll libgcc_s_seh-1.dll libstdc++-6.dll libwinpthread-1.dll)
+    find_program(WINDEPLOYQT_EXECUTABLE windeployqt
-        if(EXISTS "${_mingw_bin}/${_dll}")
+        HINTS "${_mingw_bin}" "${Qt6_DIR}/../../../bin")
-            install(FILES "${_mingw_bin}/${_dll}" DESTINATION .)
+
+    # Pass config-time paths into the install-time script below.
+    install(CODE "set(_WINDEPLOYQT \"${WINDEPLOYQT_EXECUTABLE}\")")
+    install(CODE "set(_MINGW_BIN \"${_mingw_bin}\")")
+
+    install(CODE [[
+        if(POLICY CMP0207)
+            cmake_policy(SET CMP0207 NEW)
         endif()
-    endforeach()
+
+        # 1) Resolve the exe's full transitive DLL closure from the mingw bin
+        #    dir. This MUST run before windeployqt: at this point the package
+        #    contains only the .exe, so each dependency (Qt6Core.dll, libpng,
+        #    zlib, freetype, harfbuzz, pcre2, zstd, brotli, icu, libgcc/
+        #    libstdc++/winpthread, ...) resolves to exactly one path. Running
+        #    after windeployqt would find duplicates (staging vs. mingw) and
+        #    abort with "Multiple conflicting paths". System DLLs are excluded.
+        file(GET_RUNTIME_DEPENDENCIES
+            EXECUTABLES "${CMAKE_INSTALL_PREFIX}/apart-controller.exe"
+            RESOLVED_DEPENDENCIES_VAR _resolved
+            UNRESOLVED_DEPENDENCIES_VAR _unresolved
+            DIRECTORIES "${_MINGW_BIN}"
+            PRE_EXCLUDE_REGEXES "api-ms-win-.*" "ext-ms-.*"
+            POST_EXCLUDE_REGEXES ".*[Ss]ystem32.*" ".*[Ss]ysWOW64.*")
+        foreach(_dll ${_resolved})
+            file(INSTALL DESTINATION "${CMAKE_INSTALL_PREFIX}"
+                TYPE SHARED_LIBRARY FOLLOW_SYMLINK_CHAIN FILES "${_dll}")
+        endforeach()
+
+        # 2) windeployqt now adds the runtime-loaded Qt *plugins*
+        #    (platforms/qwindows.dll, styles, imageformats) plus any helper
+        #    DLLs those plugins need. It is fine for it to re-copy Qt DLLs.
+        if(_WINDEPLOYQT)
+            execute_process(COMMAND "${_WINDEPLOYQT}"
+                --release --no-translations --no-system-d3d-compiler
+                --dir "${CMAKE_INSTALL_PREFIX}"
+                "${CMAKE_INSTALL_PREFIX}/apart-controller.exe")
+        endif()
+    ]])
 endif()
 
 set(CPACK_PACKAGE_NAME "Apart Concept 1 Controller")