### 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)

SIGNAL_CHECK_FALSE("text_set");
			
			text_edit->select_all();
			MessageQueue::get_singleton()->flush();
			CHECK(text_edit->has_selection());
			CHECK(text_edit->get_selection_from_line() == 0);
			CHECK(text_edit->get_selection_to_line() == 2);
			SIGNAL_CHECK_FALSE("caret_changed");
			((Array)lines_edited_args[0])[0] = 2;
			((Array)lines_edited_args[0])[1] = 3;
			text_edit->insert_line_at(2, "after");
			MessageQueue::get_singleton()->flush();
			CHECK(text_edit->get_text() == "new\ntesting\nafter\nswap");
			CHECK(text_edit->get_caret_line() == 3);
			CHECK(text_edit->get_caret_column() == text_edit->get_line(3).size() - 1);
			CHECK(text_edit->has_selection());
			CHECK(text_edit->get_selection_from_line() == 0);
			CHECK(text_edit->get_selection_to_line() == 3);
			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
			SIGNAL_CHECK("caret_changed", empty_signal_args);
			SIGNAL_CHECK("text_changed", empty_signal_args);
			SIGNAL_CHECK_FALSE("text_set");
			
			ERR_PRINT_OFF;
			text_edit->insert_line_at(-1, "after");
			CHECK(text_edit->get_text() == "new\ntesting\nafter\nswap");
			SIGNAL_CHECK_FALSE("lines_edited_from");
			SIGNAL_CHECK_FALSE("caret_changed");
			SIGNAL_CHECK_FALSE("text_changed");
			SIGNAL_CHECK_FALSE("text_set");