### Godot version

4.0.2.stable.official [7a0977ce2]

### System information

Windows 10

### Issue description

LineEdit node with enabled "expand_to_text_length" option and "minimum_character_width = 0" and cleared margins in style overrides still has some empty space inside
![node](https://github.com/godotengine/godot/assets/23380802/86c79678-8422-4a98-8406-602edd7dc48b)
![node settings](https://github.com/godotengine/godot/assets/23380802/11d04d71-bbf1-4c16-8155-fe39b5bbd66b)
![style overrides](https://github.com/godotengine/godot/assets/23380802/6b3c3925-b4bd-455b-aac1-ddeb54a4d796)


### Steps to reproduce

1. Add LineEdit node
2. Set expand_to_text_length = true
3. Set minimum_character_width in theme overrides = 0
4. Set normal to StyleBoxEmpty


### Minimal reproduction project

[LineEdit can't be zero sized.zip](https://github.com/godotengine/godot/files/11566017/LineEdit.can.t.be.zero.sized.zip)

Rect2 trect = Rect2(caret.l_caret.position.x - 2.5 * caret_width, caret.l_caret.position.y, 6 * caret_width, caret_width);
							trect.position += ofs;
							RenderingServer::get_singleton()->canvas_item_add_rect(ci, trect, caret_color);
						} else if (caret.l_caret != Rect2() && caret.t_caret != Rect2() && caret.l_dir != caret.t_dir) {
							
							float d = (caret.l_dir == TextServer::DIRECTION_LTR) ? 0.5 : -3;
							Rect2 trect = Rect2(caret.l_caret.position.x + d * caret_width, caret.l_caret.position.y + caret.l_caret.size.y - caret_width, 3 * caret_width, caret_width);
							trect.position += ofs;
							RenderingServer::get_singleton()->canvas_item_add_rect(ci, trect, caret_color);
							d = (caret.t_dir == TextServer::DIRECTION_LTR) ? 0.5 : -3;
							trect = Rect2(caret.t_caret.position.x + d * caret_width, caret.t_caret.position.y, 3 * caret_width, caret_width);
							trect.position += ofs;
							RenderingServer::get_singleton()->canvas_item_add_rect(ci, trect, caret_color);
						}
						caret.l_caret.position += ofs;
						caret.l_caret.size.x = caret_width;
						RenderingServer::get_singleton()->canvas_item_add_rect(ci, caret.l_caret, caret_color);
						caret.t_caret.position += ofs;
						caret.t_caret.size.x = caret_width;
						RenderingServer::get_singleton()->canvas_item_add_rect(ci, caret.t_caret, caret_color);
					}
				}
				if (!ime_text.is_empty()) {
					{
						
						Vector<Vector2> sel = TS->shaped_text_get_selection(text_rid, caret_column, caret_column + ime_text.length());
						for (int i = 0; i < sel.size(); i++) {
							Rect2 rect = Rect2(sel[i].x + ofs.x, ofs.y, sel[i].y - sel[i].x, text_height);
							if (rect.position.x + rect.size.x <= x_ofs || rect.position.x > ofs_max) {
								continue;