Isolate XCNewEditor default build from ImGui headers

tests/NewEditor/CMakeLists.txt

@@ -85,6 +85,9 @@ set(NEW_EDITOR_SHELL_CHROME_STATE_HEADER
 set(NEW_EDITOR_SHELL_CHROME_STATE_SOURCE
     ${CMAKE_SOURCE_DIR}/new_editor/src/XCUIBackend/XCUIShellChromeState.cpp
 )
+set(NEW_EDITOR_NATIVE_SHELL_LAYOUT_HEADER
+    ${CMAKE_SOURCE_DIR}/new_editor/src/XCUIBackend/XCUINativeShellLayout.h
+)
 set(NEW_EDITOR_APPLICATION_HEADER
     ${CMAKE_SOURCE_DIR}/new_editor/src/Application.h
 )
@@ -115,6 +118,9 @@ set(NEW_EDITOR_IMGUI_TEXT_ATLAS_PROVIDER_HEADER
 set(NEW_EDITOR_IMGUI_TEXT_ATLAS_PROVIDER_SOURCE
     ${CMAKE_SOURCE_DIR}/new_editor/src/XCUIBackend/ImGuiTextAtlasProvider.cpp
 )
+set(NEW_EDITOR_IMGUI_HOST_COMPOSITOR_SOURCE
+    ${CMAKE_SOURCE_DIR}/new_editor/src/XCUIBackend/ImGuiHostCompositor.cpp
+)
 set(NEW_EDITOR_FONT_SETUP_HEADER
     ${CMAKE_SOURCE_DIR}/new_editor/src/XCUIBackend/XCUIEditorFontSetup.h
 )
@@ -130,6 +136,12 @@ set(NEW_EDITOR_STANDALONE_TEXT_ATLAS_PROVIDER_SOURCE
 set(NEW_EDITOR_HOSTED_PREVIEW_PRESENTER_HEADER
     ${CMAKE_SOURCE_DIR}/new_editor/src/XCUIBackend/XCUIHostedPreviewPresenter.h
 )
+set(NEW_EDITOR_LEGACY_IMGUI_HOST_INTEROP_HEADER
+    ${CMAKE_SOURCE_DIR}/new_editor/src/XCUIBackend/LegacyImGuiHostInterop.h
+)
+set(NEW_EDITOR_LEGACY_IMGUI_HOST_INTEROP_SOURCE
+    ${CMAKE_SOURCE_DIR}/new_editor/src/XCUIBackend/LegacyImGuiHostInterop.cpp
+)
 set(NEW_EDITOR_WINDOW_UI_COMPOSITOR_HEADER
     ${CMAKE_SOURCE_DIR}/new_editor/src/XCUIBackend/IWindowUICompositor.h
 )
@@ -411,6 +423,51 @@ else()
     message(STATUS "Skipping new_editor_xcui_hosted_preview_presenter_tests because presenter header or ImGui sources are missing.")
 endif()
 
+if(EXISTS "${NEW_EDITOR_LEGACY_IMGUI_HOST_INTEROP_HEADER}" AND
+   EXISTS "${NEW_EDITOR_LEGACY_IMGUI_HOST_INTEROP_SOURCE}" AND
+   EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/test_legacy_imgui_host_interop.cpp" AND
+   EXISTS "${CMAKE_BINARY_DIR}/_deps/imgui-src/imgui.cpp")
+    add_executable(new_editor_legacy_imgui_host_interop_tests
+        test_legacy_imgui_host_interop.cpp
+        ${NEW_EDITOR_LEGACY_IMGUI_HOST_INTEROP_SOURCE}
+        ${NEW_EDITOR_IMGUI_HOST_COMPOSITOR_SOURCE}
+        ${NEW_EDITOR_FONT_SETUP_SOURCE}
+        ${CMAKE_BINARY_DIR}/_deps/imgui-src/imgui.cpp
+        ${CMAKE_BINARY_DIR}/_deps/imgui-src/imgui_demo.cpp
+        ${CMAKE_BINARY_DIR}/_deps/imgui-src/imgui_draw.cpp
+        ${CMAKE_BINARY_DIR}/_deps/imgui-src/imgui_tables.cpp
+        ${CMAKE_BINARY_DIR}/_deps/imgui-src/imgui_widgets.cpp
+        ${CMAKE_BINARY_DIR}/_deps/imgui-src/backends/imgui_impl_win32.cpp
+        ${CMAKE_BINARY_DIR}/_deps/imgui-src/backends/imgui_impl_dx12.cpp
+    )
+
+    xcengine_configure_new_editor_test_target(new_editor_legacy_imgui_host_interop_tests)
+
+    target_link_libraries(new_editor_legacy_imgui_host_interop_tests
+        PRIVATE
+        XCEngine
+        GTest::gtest
+        GTest::gtest_main
+        d3d12
+        dxgi
+        user32
+        gdi32
+        comdlg32
+    )
+
+    target_include_directories(new_editor_legacy_imgui_host_interop_tests PRIVATE
+        ${CMAKE_SOURCE_DIR}/engine/include
+        ${CMAKE_SOURCE_DIR}/new_editor/src
+        ${CMAKE_SOURCE_DIR}/editor/src
+        ${CMAKE_BINARY_DIR}/_deps/imgui-src
+        ${CMAKE_BINARY_DIR}/_deps/imgui-src/backends
+    )
+
+    xcengine_discover_new_editor_gtests(new_editor_legacy_imgui_host_interop_tests)
+else()
+    message(STATUS "Skipping new_editor_legacy_imgui_host_interop_tests because helper, test source, or ImGui sources are missing.")
+endif()
+
 if(EXISTS "${NEW_EDITOR_WINDOW_UI_COMPOSITOR_HEADER}" AND
    EXISTS "${NEW_EDITOR_IMGUI_WINDOW_UI_COMPOSITOR_HEADER}" AND
    EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/test_imgui_window_ui_compositor.cpp")
@@ -469,9 +526,6 @@ if(EXISTS "${NEW_EDITOR_WINDOW_UI_COMPOSITOR_HEADER}" AND
     target_include_directories(new_editor_native_window_ui_compositor_tests PRIVATE
         ${CMAKE_SOURCE_DIR}/engine/include
         ${CMAKE_SOURCE_DIR}/new_editor/src
-        ${CMAKE_SOURCE_DIR}/editor/src
-        ${CMAKE_BINARY_DIR}/_deps/imgui-src
-        ${CMAKE_BINARY_DIR}/_deps/imgui-src/backends
     )
 
     xcengine_discover_new_editor_gtests(new_editor_native_window_ui_compositor_tests)
@@ -586,6 +640,31 @@ else()
     message(STATUS "Skipping new_editor_xcui_shell_chrome_state_tests because shell chrome state files or the test source are missing.")
 endif()
 
+if(EXISTS "${NEW_EDITOR_NATIVE_SHELL_LAYOUT_HEADER}" AND
+   EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/test_xcui_native_shell_layout.cpp")
+    add_executable(new_editor_xcui_native_shell_layout_tests
+        test_xcui_native_shell_layout.cpp
+    )
+
+    xcengine_configure_new_editor_test_target(new_editor_xcui_native_shell_layout_tests)
+
+    target_link_libraries(new_editor_xcui_native_shell_layout_tests
+        PRIVATE
+        XCEngine
+        GTest::gtest
+        GTest::gtest_main
+    )
+
+    target_include_directories(new_editor_xcui_native_shell_layout_tests PRIVATE
+        ${CMAKE_SOURCE_DIR}/engine/include
+        ${CMAKE_SOURCE_DIR}/new_editor/src
+    )
+
+    xcengine_discover_new_editor_gtests(new_editor_xcui_native_shell_layout_tests)
+else()
+    message(STATUS "Skipping new_editor_xcui_native_shell_layout_tests because the layout helper header or the test source is missing.")
+endif()
+
 if(EXISTS "${NEW_EDITOR_APPLICATION_HEADER}" AND
    EXISTS "${NEW_EDITOR_COMMAND_ROUTER_SOURCE}" AND
    EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/test_application_shell_command_bindings.cpp")
@@ -606,9 +685,6 @@ if(EXISTS "${NEW_EDITOR_APPLICATION_HEADER}" AND
     target_include_directories(new_editor_application_shell_command_bindings_tests PRIVATE
         ${CMAKE_SOURCE_DIR}/engine/include
         ${CMAKE_SOURCE_DIR}/new_editor/src
-        ${CMAKE_SOURCE_DIR}/editor/src
-        ${CMAKE_BINARY_DIR}/_deps/imgui-src
-        ${CMAKE_BINARY_DIR}/_deps/imgui-src/backends
     )
 
     xcengine_discover_new_editor_gtests(new_editor_application_shell_command_bindings_tests)

tests/NewEditor/test_native_window_ui_compositor.cpp

@@ -1,5 +1,6 @@
 #include <gtest/gtest.h>
 
+#include "Platform/D3D12WindowRenderer.h"
 #include "XCUIBackend/IWindowUICompositor.h"
 #include "XCUIBackend/NativeWindowUICompositor.h"
 #include "XCUIBackend/UITextureRegistration.h"