editor: prefer bundled mono runtime discovery

editor/CMakeLists.txt

@@ -32,12 +32,16 @@ if(NOT TARGET XCEngine)
     option(XCENGINE_ENABLE_MONO_SCRIPTING "Build the Mono-based C# scripting runtime" ON)
 
     if(NOT DEFINED XCENGINE_MONO_ROOT_DIR OR XCENGINE_MONO_ROOT_DIR STREQUAL "")
+        if(EXISTS "${XCENGINE_ROOT_DIR}/engine/third_party/mono/binary/mscorlib.dll")
+            set(XCENGINE_MONO_ROOT_DIR_DEFAULT "${XCENGINE_ROOT_DIR}/engine/third_party/mono")
+        else()
             file(GLOB XCENGINE_MONO_ROOT_DIR_CANDIDATES "${XCENGINE_ROOT_DIR}/*/Fermion/Fermion/external/mono")
             if(XCENGINE_MONO_ROOT_DIR_CANDIDATES)
                 list(GET XCENGINE_MONO_ROOT_DIR_CANDIDATES 0 XCENGINE_MONO_ROOT_DIR_DEFAULT)
             else()
                 set(XCENGINE_MONO_ROOT_DIR_DEFAULT "${XCENGINE_ROOT_DIR}/managed/mono")
             endif()
+        endif()
 
         set(
             XCENGINE_MONO_ROOT_DIR

editor/src/Scripting/EditorScriptAssemblyBuilder.cpp

@@ -48,6 +48,11 @@ std::filesystem::path FindBundledMonoRootDirectory(const std::filesystem::path&
         return {};
     }
 
+    const std::filesystem::path projectBundledMonoRoot = repositoryRoot / "engine" / "third_party" / "mono";
+    if (std::filesystem::exists(projectBundledMonoRoot / "binary" / "mscorlib.dll", ec)) {
+        return projectBundledMonoRoot.lexically_normal();
+    }
+
     for (std::filesystem::directory_iterator it(repositoryRoot, ec), end; it != end && !ec; it.increment(ec)) {
         if (ec || !it->is_directory(ec)) {
             continue;

engine/CMakeLists.txt

@@ -715,7 +715,6 @@ if(MSVC)
         COMPILE_PDB_OUTPUT_DIRECTORY_RELEASE "${CMAKE_CURRENT_BINARY_DIR}/compile-pdb/Release"
         COMPILE_PDB_OUTPUT_DIRECTORY_MINSIZEREL "${CMAKE_CURRENT_BINARY_DIR}/compile-pdb/MinSizeRel"
         COMPILE_PDB_OUTPUT_DIRECTORY_RELWITHDEBINFO "${CMAKE_CURRENT_BINARY_DIR}/compile-pdb/RelWithDebInfo"
-        VS_GLOBAL_UseMultiToolTask "false"
     )
 endif()