### 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)

Vector<int> last_visible_chars;
	};
	HashMap<int, LineDrawingCache> line_drawing_cache;
	int _get_char_pos_for_line(int p_px, int p_line, int p_wrap_index = 0) const;
	
	struct Selection {
		bool active = false;
		bool shiftclick_left = false;
		int selecting_line = 0;
		int selecting_column = 0;
		int selected_word_beg = 0;
		int selected_word_end = 0;
		int selected_word_origin = 0;
		int from_line = 0;
		int from_column = 0;
		int to_line = 0;
		int to_column = 0;
	};
	struct Caret {
		Selection selection;
		Point2 draw_pos;
		bool visible = false;
		int last_fit_x = 0;
		int line = 0;
		int column = 0;
	};
	
	Vector<Caret> carets;
	Vector<int> caret_index_edit_order;
	bool setting_caret_line = false;