Add a background brush to the window

So the background always gets cleared out when the window resizes.

CHANGELOG.md

@@ -45,6 +45,11 @@ TODO: Add an updates screenshot with some fancy VST3-only plugins to the readme
   and 5.8 required a change, but that change now breaks builds using Wine 6.0
   and up, so this change has been reverted.
 
+### Fixed
+
+- Added a background to the editor window to get rid of artifacts that could
+  occur when the plugin or the host don't resize the window correctly.
+
 ### yabridgectl
 
 - Updated for the changes in yabridge 3.0. Yabridgectl now allows you to set up

meson.build

@@ -188,6 +188,7 @@ bitsery_dep = subproject('bitsery', version : '5.2.0').get_variable('bitsery_dep
 function2_dep = subproject('function2', version : '4.1.0').get_variable('function2_dep')
 threads_dep = dependency('threads')
 tomlplusplus_dep = subproject('tomlplusplus', version : '2.1.0').get_variable('tomlplusplus_dep')
+wine_gdi32_dep = declare_dependency(link_args : '-lgdi32')
 # The built in threads dependency does not know how to handle winegcc
 wine_threads_dep = declare_dependency(link_args : '-lpthread')
 xcb_dep = dependency('xcb')
@@ -377,6 +378,7 @@ host_64bit_deps = [
   bitsery_dep,
   function2_dep,
   tomlplusplus_dep,
+  wine_gdi32_dep,
   wine_threads_dep,
   xcb_dep,
 ]
@@ -423,6 +425,7 @@ if with_bitbridge
     bitsery_dep,
     function2_dep,
     tomlplusplus_dep,
+    wine_gdi32_dep,
     wine_threads_dep,
     xcb_32bit_dep,
   ]

src/wine-host/editor.cpp

@@ -666,6 +666,7 @@ ATOM register_window_class(std::string window_class_name) {
     window_class.lpfnWndProc = window_proc;
     window_class.hInstance = GetModuleHandle(nullptr);
     window_class.hCursor = LoadCursor(nullptr, IDC_ARROW);
+    window_class.hbrBackground = CreateSolidBrush(RGB(32, 32, 32));
     window_class.lpszClassName = window_class_name.c_str();
 
     return RegisterClassEx(&window_class);