### Godot version

v4.0.beta10.official [d0398f62f]

### System information

Windows 22H2, Compatibility, GeForce GTX 550 Ti

### Issue description

Multiple lines of error messages are copied without line breaks:
The script editor's error panel shows:
```
Line 6:Expected parameter name.
Line 6:Expected closing ")" after function parameters.
Line 6:Expected ":" after function declaration.
```
But selecting and copying them `ctrl c`, copies them without line breaks:
```
Line 6:Expected parameter name.Line 6:Expected closing ")" after function parameters.Line 6:Expected ":" after function declaration.
```


### Steps to reproduce

- start Godot
- open the attached project
- open the script `Node2D.gd`
The status bar shows an error message.
- click on the red circle with an x in it, and the number 3 to the right of the circle.
The script editor's error panel shows three messages:
>Line 6:Expected parameter name.
Line 6:Expected closing ")" after function parameters.
Line 6:Expected ":" after function declaration.

- select all three lines, and copy them `ctrl c`
- in the script editor, click on the empty line 12 to place the cursor there.
- paste `ctrl v`

### Expected
The copied lines should be pasted on three lines, as they appeared in the error panel.

### Observed
There are no line breaks, they appear on the same line:
```
Line 6:Expected parameter name.Line 6:Expected closing ")" after function parameters.Line 6:Expected ":" after function declaration.
```


### Minimal reproduction project

[issue, error messages copied without line breaks.zip](https://github.com/godotengine/godot/files/10361376/issue.error.messages.copied.without.line.breaks.zip)

if (p_color) {
			context_menu->add_item(TTR("Pick Color"), EDIT_PICK_COLOR);
		}
	}
	const CodeEdit *tx = code_editor->get_text_editor();
	context_menu->set_item_disabled(context_menu->get_item_index(EDIT_UNDO), !tx->has_undo());
	context_menu->set_item_disabled(context_menu->get_item_index(EDIT_REDO), !tx->has_redo());
	context_menu->set_position(get_screen_position() + p_pos);
	context_menu->reset_size();
	context_menu->popup();
}
void ScriptTextEditor::_enable_code_editor() {
	ERR_FAIL_COND(code_editor->get_parent());
	VSplitContainer *editor_box = memnew(VSplitContainer);
	add_child(editor_box);
	editor_box->set_anchors_and_offsets_preset(Control::PRESET_FULL_RECT);
	editor_box->set_v_size_flags(SIZE_EXPAND_FILL);
	editor_box->add_child(code_editor);
	code_editor->connect("show_errors_panel", callable_mp(this, &ScriptTextEditor::_show_errors_panel));
	code_editor->connect("show_warnings_panel", callable_mp(this, &ScriptTextEditor::_show_warnings_panel));
	code_editor->connect("validate_script", callable_mp(this, &ScriptTextEditor::_validate_script));
	code_editor->connect("load_theme_settings", callable_mp(this, &ScriptTextEditor::_load_theme_settings));
	code_editor->get_text_editor()->connect("symbol_lookup", callable_mp(this, &ScriptTextEditor::_lookup_symbol));
	code_editor->get_text_editor()->connect("symbol_validate", callable_mp(this, &ScriptTextEditor::_validate_symbol));
	code_editor->get_text_editor()->connect("gutter_added", callable_mp(this, &ScriptTextEditor::_update_gutter_indexes));
	code_editor->get_text_editor()->connect("gutter_removed", callable_mp(this, &ScriptTextEditor::_update_gutter_indexes));
	code_editor->get_text_editor()->connect("gutter_clicked", callable_mp(this, &ScriptTextEditor::_gutter_clicked));
	code_editor->get_text_editor()->connect("gui_input", callable_mp(this, &ScriptTextEditor::_text_edit_gui_input));
	code_editor->show_toggle_scripts_button();
	_update_gutter_indexes();