### 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)

MessageQueue::get_singleton()->flush();
			SIGNAL_CHECK_FALSE("text_changed");
			SIGNAL_CHECK_FALSE("caret_changed");
			SIGNAL_CHECK_FALSE("lines_edited_from");
			text_edit->set_caret_line(2);
			text_edit->set_caret_column(0);
			MessageQueue::get_singleton()->flush();
			SIGNAL_DISCARD("caret_changed");
			((Array)lines_edited_args[0])[0] = 2;
			((Array)lines_edited_args[0])[1] = 1;
			text_edit->backspace();
			MessageQueue::get_singleton()->flush();
			CHECK(text_edit->get_text() == "this is\nsome");
			CHECK(text_edit->get_caret_line() == 1);
			CHECK(text_edit->get_caret_column() == 4);
			SIGNAL_CHECK("caret_changed", empty_signal_args);
			SIGNAL_CHECK("text_changed", empty_signal_args);
			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
			((Array)lines_edited_args[0])[0] = 1;
			text_edit->backspace();
			MessageQueue::get_singleton()->flush();
			CHECK(text_edit->get_text() == "this is\nsom");
			CHECK(text_edit->get_caret_line() == 1);
			CHECK(text_edit->get_caret_column() == 3);
			SIGNAL_CHECK("caret_changed", empty_signal_args);
			SIGNAL_CHECK("text_changed", empty_signal_args);
			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
			text_edit->end_complex_operation();
			text_edit->select(1, 0, 1, 3);
			text_edit->backspace();