### 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)

end--;
				}
			} else {
				begin = 0;
				end = tx->get_line_count() - 1;
			}
			scr->get_language()->auto_indent_code(text, begin, end);
			Vector<String> lines = text.split("\n");
			for (int i = begin; i <= end; ++i) {
				tx->set_line(i, lines[i]);
			}
			tx->end_complex_operation();
		} break;
		case EDIT_TRIM_TRAILING_WHITESAPCE: {
			trim_trailing_whitespace();
		} break;
		case EDIT_CONVERT_INDENT_TO_SPACES: {
			tx->set_indent_using_spaces(true);
			convert_indent();
		} break;
		case EDIT_CONVERT_INDENT_TO_TABS: {
			tx->set_indent_using_spaces(false);
			convert_indent();
		} break;
		case EDIT_PICK_COLOR: {
			color_panel->popup();
		} break;
		case EDIT_TO_UPPERCASE: {
			_convert_case(CodeTextEditor::UPPER);
		} break;