0.1.9: Windows build fix (D8021: '/W3 /WX' as one cl argument)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

CHANGELOG.md

@@ -1,3 +1,9 @@
+## 0.1.9
+
+* Windows: the plugin builds again. Its per-source compile options passed
+  "/W3 /WX" to cl.exe as one argument (error D8021); now plain /W3 for all
+  sources, without warnings-as-errors.
+
 ## 0.1.8
 
 * Linux, debug builds only: a Flutter hot restart no longer crashes apps that

pubspec.yaml

@@ -1,6 +1,6 @@
 name: fox_utils
 description: A collection of reusable Flutter widgets and extensions.
-version: 0.1.8
+version: 0.1.9
 
 environment:
   sdk: ^3.9.2

windows/CMakeLists.txt

@@ -19,15 +19,12 @@ target_include_directories(${PLUGIN_NAME} INTERFACE
         "${CMAKE_CURRENT_SOURCE_DIR}/include")
 target_link_libraries(${PLUGIN_NAME} PRIVATE flutter flutter_wrapper_plugin)
 
-# GdiPlus doesn't compile with /W4 warning level; strict flags are scoped to
-# this package's own sources. The vendored desktop_drop engine is compiled
-# as upstream ships it (no warnings-as-errors) since it is not ours to churn.
-set_source_files_properties("fox_utils_plugin.cpp" "pasteboard_plugin.cpp"
-        PROPERTIES COMPILE_OPTIONS
-        "$<$<CXX_COMPILER_ID:MSVC>:/W3 /WX>;$<$<NOT:$<CXX_COMPILER_ID:MSVC>>:-Wall -Wextra -Wpedantic -Werror>")
-set_source_files_properties("desktop_drop_plugin.cpp"
-        PROPERTIES COMPILE_OPTIONS
-        "$<$<CXX_COMPILER_ID:MSVC>:/W3>")
+# GdiPlus doesn't compile with /W4 (the template's level): all sources use
+# /W3, one option per list entry ("/W3 /WX" in one entry reaches cl.exe as a
+# single bad argument, D8021). No warnings-as-errors: a newer MSVC's new
+# warning must not break app releases.
+set_source_files_properties("fox_utils_plugin.cpp" "pasteboard_plugin.cpp" "desktop_drop_plugin.cpp"
+        PROPERTIES COMPILE_OPTIONS "/W3")
 
 # List of absolute paths to libraries that should be bundled with the plugin
 set(fox_utils_bundled_libraries