### 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.
for (int i = 0; i < carets.size(); i++) {
		if (p_select) {
			_pre_shift_selection(i);
		} else {
			deselect(i);
		}
		
		Vector<String> rows = get_line_wrapped_text(get_caret_line(i));
		int wi = get_caret_wrap_index(i);
		int row_start_col = 0;
		for (int j = 0; j < wi; j++) {
			row_start_col += rows[j].length();
		}
		if (get_caret_column(i) == row_start_col || wi == 0) {
			
			int current_line_whitespace_len = get_first_non_whitespace_column(get_caret_line(i));
			if (get_caret_column(i) == current_line_whitespace_len) {
				set_caret_column(0, i == 0, i);
			} else {
				set_caret_column(current_line_whitespace_len, i == 0, i);
			}
		} else {
			set_caret_column(row_start_col, i == 0, i);
		}
		if (p_select) {
			_post_shift_selection(i);
		}