### Godot version

4.0 stable

### System information

Manjaro Linux, kernel 6.1.1-1-MANJARO, AMD Ryzen 5 3600, AMD RX 580

### Issue description

The `wrap_mode` property of the `TextEdit` node doesn't seem to really do anything. Setting it to `LINE_WRAPPING_BOUNDARY` simply means that there won't be an horizontal scrollbar if the text overshoots the boundary, instead of actually forcing the text to the next line so that it stays visible.

### Steps to reproduce

Create a TextEdit node and set its `wrap_mode` property to `LINE_WRAPPING_BOUNDARY`

### Minimal reproduction project

[WrapBugDemo.zip](https://github.com/godotengine/godot/files/10875969/WrapBugDemo.zip)

if (has_selection(c) && line >= get_selection_from_line(c) && line <= get_selection_to_line(c) && char_margin >= xmargin_beg) {
								float char_w = theme_cache.font->get_char_size(' ', theme_cache.font_size).width;
								if (rtl) {
									RenderingServer::get_singleton()->canvas_item_add_rect(ci, Rect2(size.width - xmargin_beg - ofs_x - char_w, ofs_y, char_w, row_height), theme_cache.selection_color);
								} else {
									RenderingServer::get_singleton()->canvas_item_add_rect(ci, Rect2(xmargin_beg + ofs_x, ofs_y, char_w, row_height), theme_cache.selection_color);
								}
							}
						}
					} else {
						
						if (caret_line_wrap_index_map.has(line) && caret_line_wrap_index_map[line].has(line_wrap_index) && highlight_current_line) {
							if (rtl) {
								RenderingServer::get_singleton()->canvas_item_add_rect(ci, Rect2(size.width - ofs_x - xmargin_end, ofs_y, xmargin_end, row_height), theme_cache.current_line_color);
							} else {
								RenderingServer::get_singleton()->canvas_item_add_rect(ci, Rect2(ofs_x, ofs_y, xmargin_end, row_height), theme_cache.current_line_color);
							}
						}
					}
					if (line_wrap_index == 0) {
						
						cache_entry.y_offset = ofs_y;
						int gutter_offset = theme_cache.style_normal->get_margin(SIDE_LEFT);
						for (int g = 0; g < gutters.size(); g++) {
							const GutterInfo gutter = gutters[g];
							if (!gutter.draw || gutter.width <= 0) {
								continue;
							}
							switch (gutter.type) {
								case GUTTER_TYPE_STRING: {