Add option for WCHAR32 support in ImGUI (#13285)

ports/imgui/CMakeLists.txt

@@ -22,6 +22,13 @@ target_sources(
 		${CMAKE_CURRENT_SOURCE_DIR}/misc/cpp/imgui_stdlib.cpp
 )
 
+
+if(IMGUI_USE_WCHAR32)
+	FILE(READ ${CMAKE_CURRENT_SOURCE_DIR}/imconfig.h IMCONFIG)
+	STRING(REGEX REPLACE "//#define IMGUI_USE_WCHAR32" "#define IMGUI_USE_WCHAR32" IMCONFIG "${IMCONFIG}")
+	FILE(WRITE ${CMAKE_CURRENT_SOURCE_DIR}/imconfig.h "${IMCONFIG}")
+endif()
+
 if(IMGUI_BUILD_ALLEGRO5_BINDING)
 	find_path(ALLEGRO5_INCLUDE_DIRS allegro5/allegro.h)
 	target_include_directories(${PROJECT_NAME} PRIVATE ${ALLEGRO5_INCLUDE_DIRS})
@@ -172,7 +179,7 @@ if(NOT IMGUI_SKIP_HEADERS)
 		file(GLOB MARMALADE_BINDING_SRCS ${CMAKE_CURRENT_SOURCE_DIR}/examples/imgui_impl_marmalade.*)
 		install(FILES ${MARMALADE_BINDING_SRCS} DESTINATION include/bindings)
 	endif()
-	
+
 	if(IMGUI_BUILD_METAL_BINDING)
 		install(FILES ${CMAKE_CURRENT_SOURCE_DIR}/examples/imgui_impl_metal.h DESTINATION include)
 	endif()

ports/imgui/CONTROL

@@ -1,6 +1,6 @@
 Source: imgui
 Version: 1.78
-Port-Version: 2
+Port-Version: 3
 Homepage: https://github.com/ocornut/imgui
 Description: Bloat-free Immediate Mode Graphical User interface for C++ with minimal dependencies.
 
@@ -73,3 +73,6 @@ Build-Depends: freetype
 
 Feature: libigl-imgui
 Description: Install the libigl-imgui headers
+
+Feature: wchar32
+Description: Use WCHAR32 instead of WCHAR16

ports/imgui/portfile.cmake

@@ -34,6 +34,7 @@ vcpkg_check_features(OUT_FEATURE_OPTIONS FEATURE_OPTIONS
     vulkan-binding              IMGUI_BUILD_VULKAN_BINDING
     win32-binding               IMGUI_BUILD_WIN32_BINDING
     freetype                    IMGUI_FREETYPE
+    wchar32                     IMGUI_USE_WCHAR32
 )
 
 if ("libigl-imgui" IN_LIST FEATURES)