### Feature request

`customButtonsOnHover` fixes a lot of issues with drag and `pointer` styles, but my app currently uses `hidden-inset` so this setting changes the position of the buttons. I'd suggest `customButtonsOnHover` either be an option outside of `titleBarStyle` that respects `titleBarStyle`s values ('hiddenInset' or `hidden') or the addition of a `customButtonsOnHoverInset`.

As a separate note, the docs for `customButtonsOnHover` currently specify it's a Boolean type, but it's a string value.
shell/browser/api/electron_api_base_window.cc
window_->SetOpacity(opacity);
}
double BaseWindow::GetOpacity() {
  return window_->GetOpacity();
}
void BaseWindow::SetShape(const std::vector<gfx::Rect>& rects) {
  window_->widget()->SetShape(std::make_unique<std::vector<gfx::Rect>>(rects));
}
void BaseWindow::SetRepresentedFilename(const std::string& filename) {
  window_->SetRepresentedFilename(filename);
}
std::string BaseWindow::GetRepresentedFilename() {
  return window_->GetRepresentedFilename();
}
void BaseWindow::SetDocumentEdited(bool edited) {
  window_->SetDocumentEdited(edited);
}
bool BaseWindow::IsDocumentEdited() {
  return window_->IsDocumentEdited();
}
void BaseWindow::SetIgnoreMouseEvents(bool ignore,
                                      gin_helper::Arguments* args) {
  gin_helper::Dictionary options;
  bool forward = false;
  args->GetNext(&options) && options.Get("forward", &forward);
  return window_->SetIgnoreMouseEvents(ignore, forward);
}
void BaseWindow::SetContentProtection(bool enable) {