Windows-Native: Initialize all struct members with a default value on construction.

windows/src/main/cpp/Decorations.cpp

@@ -154,7 +154,7 @@ void UpdateRegion(WindowWrapper *wrapper) {
     // Avoid unnecessarily updating the region to avoid unnecessary redraws
     if (EqualRect(&wrapper->rgn, &old_rgn)) return;
     // Treat empty regions as NULL regions
-    RECT empty = { 0 };
+    RECT empty = { 0, 0, 0, 0 };
     if (EqualRect(&wrapper->rgn, &empty)) SetWindowRgn(wrapper->window, NULL, TRUE);
     else SetWindowRgn(wrapper->window, CreateRectRgnIndirect(&wrapper->rgn), TRUE);
 }

windows/src/main/cpp/ThemeInfo.cpp

@@ -85,7 +85,7 @@ std::string RegGetString(HKEY hKey, const LPCSTR subKey, const LPCSTR value) {
 }
 
 bool IsHighContrastMode() {
-    HIGHCONTRAST info = { 0 };
+    HIGHCONTRAST info = { 0, 0, 0 };
     info.cbSize = sizeof(HIGHCONTRAST);
     BOOL ok = SystemParametersInfo(SPI_GETHIGHCONTRAST, 0, &info, 0);
     if (ok) {