### 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)

ED_SHORTCUT("script_text_editor/auto_indent", TTR("Auto Indent"), KeyModifierMask::CMD_OR_CTRL | Key::I);
	ED_SHORTCUT_AND_COMMAND("script_text_editor/find", TTR("Find..."), KeyModifierMask::CMD_OR_CTRL | Key::F);
	ED_SHORTCUT("script_text_editor/find_next", TTR("Find Next"), Key::F3);
	ED_SHORTCUT_OVERRIDE("script_text_editor/find_next", "macos", KeyModifierMask::META | Key::G);
	ED_SHORTCUT("script_text_editor/find_previous", TTR("Find Previous"), KeyModifierMask::SHIFT | Key::F3);
	ED_SHORTCUT_OVERRIDE("script_text_editor/find_previous", "macos", KeyModifierMask::META | KeyModifierMask::SHIFT | Key::G);
	ED_SHORTCUT_AND_COMMAND("script_text_editor/replace", TTR("Replace..."), KeyModifierMask::CTRL | Key::R);
	ED_SHORTCUT_OVERRIDE("script_text_editor/replace", "macos", KeyModifierMask::ALT | KeyModifierMask::META | Key::F);
	ED_SHORTCUT("script_text_editor/find_in_files", TTR("Find in Files..."), KeyModifierMask::CMD_OR_CTRL | KeyModifierMask::SHIFT | Key::F);
	ED_SHORTCUT("script_text_editor/replace_in_files", TTR("Replace in Files..."), KeyModifierMask::CMD_OR_CTRL | KeyModifierMask::SHIFT | Key::R);
	ED_SHORTCUT("script_text_editor/contextual_help", TTR("Contextual Help"), KeyModifierMask::ALT | Key::F1);
	ED_SHORTCUT_OVERRIDE("script_text_editor/contextual_help", "macos", KeyModifierMask::ALT | KeyModifierMask::SHIFT | Key::SPACE);
	ED_SHORTCUT("script_text_editor/toggle_bookmark", TTR("Toggle Bookmark"), KeyModifierMask::CMD_OR_CTRL | KeyModifierMask::ALT | Key::B);
	ED_SHORTCUT("script_text_editor/goto_next_bookmark", TTR("Go to Next Bookmark"), KeyModifierMask::CMD_OR_CTRL | Key::B);
	ED_SHORTCUT("script_text_editor/goto_previous_bookmark", TTR("Go to Previous Bookmark"), KeyModifierMask::CMD_OR_CTRL | KeyModifierMask::SHIFT | Key::B);
	ED_SHORTCUT("script_text_editor/remove_all_bookmarks", TTR("Remove All Bookmarks"), Key::NONE);
	ED_SHORTCUT("script_text_editor/goto_function", TTR("Go to Function..."), KeyModifierMask::ALT | KeyModifierMask::CTRL | Key::F);
	ED_SHORTCUT_OVERRIDE("script_text_editor/goto_function", "macos", KeyModifierMask::CTRL | KeyModifierMask::META | Key::J);
	ED_SHORTCUT("script_text_editor/goto_line", TTR("Go to Line..."), KeyModifierMask::CMD_OR_CTRL | Key::L);
	ED_SHORTCUT("script_text_editor/toggle_breakpoint", TTR("Toggle Breakpoint"), Key::F9);
	ED_SHORTCUT_OVERRIDE("script_text_editor/toggle_breakpoint", "macos", KeyModifierMask::META | KeyModifierMask::SHIFT | Key::B);
	ED_SHORTCUT("script_text_editor/remove_all_breakpoints", TTR("Remove All Breakpoints"), KeyModifierMask::CMD_OR_CTRL | KeyModifierMask::SHIFT | Key::F9);
	ED_SHORTCUT("script_text_editor/goto_next_breakpoint", TTR("Go to Next Breakpoint"), KeyModifierMask::CMD_OR_CTRL | Key::PERIOD);
	ED_SHORTCUT("script_text_editor/goto_previous_breakpoint", TTR("Go to Previous Breakpoint"), KeyModifierMask::CMD_OR_CTRL | Key::COMMA);
	ScriptEditor::register_create_script_editor_function(create_editor);
}
void ScriptTextEditor::validate() {
	this->code_editor->validate_script();
}