Add missing CloseClipboard call

imgui.cpp

@@ -10661,7 +10661,10 @@ static void SetClipboardTextFn_DefaultImpl(void*, const char* text)
     const int wbuf_length = ImTextCountCharsFromUtf8(text, NULL) + 1;
     HGLOBAL wbuf_handle = GlobalAlloc(GMEM_MOVEABLE, (SIZE_T)wbuf_length * sizeof(ImWchar));
     if (wbuf_handle == NULL)
+    {
+        CloseClipboard();
         return;
+    }
     ImWchar* wbuf_global = (ImWchar*)GlobalLock(wbuf_handle);
     ImTextStrFromUtf8(wbuf_global, wbuf_length, text, NULL);
     GlobalUnlock(wbuf_handle);