message: Fix SetNextWindowContentSize() with 0.0f on Y axis (or SetNextWindowContentWidth()) overwriting the contents size. Broken in
diff: @@ -4544,6 +4544,7 @@ bool ImGui::Begin(const char* name, bool* p_open, ImGuiWindowFlags flags)
  {
  // Adjust passed "client size" to become a "window size"
  window->SizeContentsExplicit = g.NextWindowData.ContentSizeVal;
  + if (window->SizeContentsExplicit.y != 0.0f)
  window->SizeContentsExplicit.y += window->TitleBarHeight() + window->MenuBarHeight();
  g.NextWindowData.ContentSizeCond = 0;
  }
  