### Godot version

4.0 beta 15

### System information

Windows 10

### Issue description

It happened with both Google IME and MS-IME, and there was no problem until Beta14.
When typing Japanese characters, it is common to select a character from the suggestion window and then start typing the next character before confirming.
In this case, uncommitted characters are forcibly committed, and input of the next character begins.

**↓Beta15**

https://user-images.githubusercontent.com/186786/214753450-b493cca6-2644-4b3d-8cd2-660565cc3547.mp4

**↓Beta14**

https://user-images.githubusercontent.com/186786/214755127-dde819cc-4d63-403a-99b0-09821671f74e.mp4



### Steps to reproduce

It happened with both Google IME and MS-IME in beta15

### Minimal reproduction project

It is project independent and happens in the editor.
ERR_FAIL_COND_MSG(carets.size() <= 1, "The main caret should not be removed.");
	ERR_FAIL_INDEX(p_caret, carets.size());
	carets.remove_at(p_caret);
	caret_index_edit_dirty = true;
}
void TextEdit::remove_secondary_carets() {
	carets.resize(1);
	caret_index_edit_dirty = true;
	queue_redraw();
}
void TextEdit::merge_overlapping_carets() {