[vim/vim] [GTK3] modeless selection is not updated promptly (Issue #20969)

lilydjwg created an issue (vim/vim#20969)

### Steps to reproduce

1. Run `vim -g -f --clean`
2. Run `:file`
3. Try select some text in the message
4. The selection is either not shown at all, or updated only once or twice, significantly lagging behind mouse motion

1f2f568f9147ca68d8772869fd6b6f56901847b3 is the first 'bad' commit

### Expected behaviour

Modeless selection is updated when the mouse moves.

### Version of Vim

9.2.0920

### Environment

Arch Linux, Wayland, GTK 3.24.52.

### Logs and stack traces

```shell

```

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