### 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.
return deselect_on_focus_loss_enabled;
}
void TextEdit::set_drag_and_drop_selection_enabled(const bool p_enabled) {
	drag_and_drop_selection_enabled = p_enabled;
}
bool TextEdit::is_drag_and_drop_selection_enabled() const {
	return drag_and_drop_selection_enabled;
}
void TextEdit::set_selection_mode(SelectionMode p_mode, int p_line, int p_column, int p_caret) {
	ERR_FAIL_INDEX(p_caret, carets.size());
	selecting_mode = p_mode;
	if (p_line >= 0) {
		ERR_FAIL_INDEX(p_line, text.size());
		carets.write[p_caret].selection.selecting_line = p_line;
		carets.write[p_caret].selection.selecting_column = CLAMP(carets[p_caret].selection.selecting_column, 0, text[carets[p_caret].selection.selecting_line].length());
	}
	if (p_column >= 0) {
		ERR_FAIL_INDEX(carets[p_caret].selection.selecting_line, text.size());
		ERR_FAIL_INDEX(p_column, text[carets[p_caret].selection.selecting_line].length() + 1);
		carets.write[p_caret].selection.selecting_column = p_column;
	}
}
TextEdit::SelectionMode TextEdit::get_selection_mode() const {