### 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)

line_meta["method"] = name;
				line_meta["base_class"] = found_base_class;
				text_edit->set_line_gutter_icon(line, connection_gutter, get_parent_control()->get_theme_icon(SNAME("MethodOverride"), SNAME("EditorIcons")));
				text_edit->set_line_gutter_clickable(line, connection_gutter, true);
			} else {
				
				text_edit->set_line_gutter_icon(line, connection_gutter, get_parent_control()->get_theme_icon(SNAME("MethodOverrideAndSlot"), SNAME("EditorIcons")));
			}
			methods_found.insert(name);
		}
	}
}
void ScriptTextEditor::_update_gutter_indexes() {
	for (int i = 0; i < code_editor->get_text_editor()->get_gutter_count(); i++) {
		if (code_editor->get_text_editor()->get_gutter_name(i) == "connection_gutter") {
			connection_gutter = i;
			continue;
		}
		if (code_editor->get_text_editor()->get_gutter_name(i) == "line_numbers") {
			line_number_gutter = i;
			continue;
		}
	}
}
void ScriptTextEditor::_gutter_clicked(int p_line, int p_gutter) {
	if (p_gutter != connection_gutter) {
		return;
	}
	Dictionary meta = code_editor->get_text_editor()->get_line_gutter_metadata(p_line, p_gutter);
	String type = meta.get("type", "");