### 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 (!dragging_minimap) {
				switch (selecting_mode) {
					case SelectionMode::SELECTION_MODE_POINTER: {
						_update_selection_mode_pointer();
					} break;
					case SelectionMode::SELECTION_MODE_WORD: {
						_update_selection_mode_word();
					} break;
					case SelectionMode::SELECTION_MODE_LINE: {
						_update_selection_mode_line();
					} break;
					default: {
						break;
					}
				}
			}
		}
		
		Vector2i current_hovered_gutter = Vector2i(-1, -1);
		int left_margin = style_normal->get_margin(SIDE_LEFT);
		if (mpos.x <= left_margin + gutters_width + gutter_padding) {
			int hovered_row = get_line_column_at_pos(mpos).y;
			for (int i = 0; i < gutters.size(); i++) {
				if (!gutters[i].draw || gutters[i].width <= 0) {
					continue;
				}
				if (mpos.x >= left_margin && mpos.x < left_margin + gutters[i].width) {
					
					current_hovered_gutter = Vector2i(i, hovered_row);
					break;