### 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)

edit_menu->get_popup()->add_child(sub_menu);
		edit_menu->get_popup()->add_submenu_item(TTR("Folding"), "folding_menu");
	}
	edit_menu->get_popup()->add_separator();
	edit_menu->get_popup()->add_shortcut(ED_GET_SHORTCUT("ui_text_completion_query"), EDIT_COMPLETE);
	edit_menu->get_popup()->add_shortcut(ED_GET_SHORTCUT("script_text_editor/trim_trailing_whitespace"), EDIT_TRIM_TRAILING_WHITESAPCE);
	{
		PopupMenu *sub_menu = memnew(PopupMenu);
		sub_menu->set_name("indent_menu");
		sub_menu->add_shortcut(ED_GET_SHORTCUT("script_text_editor/convert_indent_to_spaces"), EDIT_CONVERT_INDENT_TO_SPACES);
		sub_menu->add_shortcut(ED_GET_SHORTCUT("script_text_editor/convert_indent_to_tabs"), EDIT_CONVERT_INDENT_TO_TABS);
		sub_menu->add_shortcut(ED_GET_SHORTCUT("script_text_editor/auto_indent"), EDIT_AUTO_INDENT);
		sub_menu->connect("id_pressed", callable_mp(this, &ScriptTextEditor::_edit_option));
		edit_menu->get_popup()->add_child(sub_menu);
		edit_menu->get_popup()->add_submenu_item(TTR("Indentation"), "indent_menu");
	}
	edit_menu->get_popup()->connect("id_pressed", callable_mp(this, &ScriptTextEditor::_edit_option));
	edit_menu->get_popup()->add_separator();
	{
		PopupMenu *sub_menu = memnew(PopupMenu);
		sub_menu->set_name("convert_case");
		sub_menu->add_shortcut(ED_SHORTCUT("script_text_editor/convert_to_uppercase", TTR("Uppercase"), KeyModifierMask::SHIFT | Key::F4), EDIT_TO_UPPERCASE);
		sub_menu->add_shortcut(ED_SHORTCUT("script_text_editor/convert_to_lowercase", TTR("Lowercase"), KeyModifierMask::SHIFT | Key::F5), EDIT_TO_LOWERCASE);
		sub_menu->add_shortcut(ED_SHORTCUT("script_text_editor/capitalize", TTR("Capitalize"), KeyModifierMask::SHIFT | Key::F6), EDIT_CAPITALIZE);
		sub_menu->connect("id_pressed", callable_mp(this, &ScriptTextEditor::_edit_option));
		edit_menu->get_popup()->add_child(sub_menu);
		edit_menu->get_popup()->add_submenu_item(TTR("Convert Case"), "convert_case");
	}
	edit_menu->get_popup()->add_child(highlighter_menu);
	edit_menu->get_popup()->add_submenu_item(TTR("Syntax Highlighter"), "highlighter_menu");