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Let's, make Clicks the default

Defaulting to SurrenderFocusOn::Clicks makes egui inconsistent with other platforms. Just wanted to point this out somewhere in case other people hit similar issues.

At least on Chrome (MacOS) as well as some MacOS apps, the behavior seems to be to surrender focus on press (i.e. mouse down), not click.

I found this because it also makes it hard to pass the focus to a new widget. E.g.

if ui.button("Edit").clicked() {
  editing = true;
  
  // Pass focus to the TextEdit below
  ui.memory_mut(|mem| mem.request_focus(ID));
}

if editing {
  let response = TextEdit::singleline(...).id(ID).show(ui);
  
  assert!(response.has_focus()); <--- Just to illustrate the issue
}

In the code above, TextEdit immediately surrenders its focus because the button click is detected as a "clicked elsewhere" at the end of get_response.

Having said that, I can see how Clicks is better in some cases (resize a panel or move a slider while editing text), but it might be surprising for many users.