### 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.
if (p_shift) {
		selection_fill_at_caret();
	}
}
void LineEdit::set_caret_at_pixel_pos(int p_x) {
	Ref<StyleBox> style = theme_cache.normal;
	bool rtl = is_layout_rtl();
	int x_ofs = 0;
	float text_width = TS->shaped_text_get_size(text_rid).x;
	switch (alignment) {
		case HORIZONTAL_ALIGNMENT_FILL:
		case HORIZONTAL_ALIGNMENT_LEFT: {
			if (rtl) {
				x_ofs = MAX(style->get_margin(SIDE_LEFT), int(get_size().width - style->get_margin(SIDE_RIGHT) - (text_width)));
			} else {
				x_ofs = style->get_offset().x;
			}
		} break;
		case HORIZONTAL_ALIGNMENT_CENTER: {
			if (!Math::is_zero_approx(scroll_offset)) {
				x_ofs = style->get_offset().x;
			} else {
				x_ofs = MAX(style->get_margin(SIDE_LEFT), int(get_size().width - (text_width)) / 2);
			}
		} break;
		case HORIZONTAL_ALIGNMENT_RIGHT: {
			if (rtl) {
				x_ofs = style->get_offset().x;
			} else {
				x_ofs = MAX(style->get_margin(SIDE_LEFT), int(get_size().width - style->get_margin(SIDE_RIGHT) - (text_width)));