Executing CodeEdit.do_unindent crashes Godot

[qarmin]

Godot version

4.0.beta.custom_build. 0a0e99c

System information

Ubuntu 22.04 - Nvidia GTX 970, Gnome shell 42 X11

Issue description

extends Node
func _process(delta):

	var temp_variable382 = CodeEdit.new()
	add_child(temp_variable382)
	temp_variable382.set_indent_using_spaces(true)
	temp_variable382.indent_lines()
	temp_variable382.add_caret(-24, -19)
	temp_variable382.do_unindent()

Godot crashes with this backtrace

ERROR: Index p_index = 3 is out of bounds (size() = 0).
   at: get (./core/templates/cowdata.h:155)

================================================================
handle_crash: Program crashed with signal 4
Engine version: Godot Engine v4.0.beta.custom_build (0a0e99cadc6e250ff2ee27ef31760eb9c2e21040)
Dumping the backtrace. Please include this when reporting the bug on: https://github.com/godotengine/godot/issues
[1] /lib/x86_64-linux-gnu/libc.so.6(+0x42520) [0x7fcc9ac2a520] (??:0)
[2] CowData<char32_t>::get(int) const (/home/runner/work/GodotBuilds/GodotBuilds/godot/./core/templates/cowdata.h:155 (discriminator 7))
[3] String::operator[](int) const (/home/runner/work/GodotBuilds/GodotBuilds/godot/./core/string/ustring.h:223)
[4] CodeEdit::do_unindent() (/home/runner/work/GodotBuilds/GodotBuilds/godot/scene/gui/code_edit.cpp:903 (discriminator 1))
[5] void call_with_variant_args_helper<__UnexistingClass>(__UnexistingClass*, void (__UnexistingClass::*)(), Variant const**, Callable::CallError&, IndexSequence<>) (/home/runner/work/GodotBuilds/GodotBuilds/godot/./core/variant/binder_common.h:267 (discriminator 4))
[6] void call_with_variant_args_dv<__UnexistingClass>(__UnexistingClass*, void (__UnexistingClass::*)(), Variant const**, int, Callable::CallError&, Vector<Variant> const&) (/home/runner/work/GodotBuilds/GodotBuilds/godot/./core/variant/binder_common.h:410)
[7] MethodBindT<>::call(Object*, Variant const**, int, Callable::CallError&) (/home/runner/work/GodotBuilds/GodotBuilds/godot/./core/object/method_bind.h:320)
[8] Object::callp(StringName const&, Variant const**, int, Callable::CallError&) (/home/runner/work/GodotBuilds/GodotBuilds/godot/core/object/object.cpp:733 (discriminator 1))
[9] Variant::callp(StringName const&, Variant const**, int, Variant&, Callable::CallError&) (/home/runner/work/GodotBuilds/GodotBuilds/godot/core/variant/variant_call.cpp:1048)
[10] GDScriptFunction::call(GDScriptInstance*, Variant const**, int, Callable::CallError&, GDScriptFunction::CallState*) (/home/runner/work/GodotBuilds/GodotBuilds/godot/modules/gdscript/gdscript_vm.cpp:1556)
[11] GDScriptInstance::callp(StringName const&, Variant const**, int, Callable::CallError&) (/home/runner/work/GodotBuilds/GodotBuilds/godot/modules/gdscript/gdscript.cpp:1634)
[12] bool Node::_gdvirtual__process_call<false>(double) (/home/runner/work/GodotBuilds/GodotBuilds/godot/scene/main/node.h:238 (discriminator 5))
[13] Node::_notification(int) (/home/runner/work/GodotBuilds/GodotBuilds/godot/scene/main/node.cpp:57)
[14] Node::_notificationv(int, bool) (/home/runner/work/GodotBuilds/GodotBuilds/godot/./scene/main/node.h:45 (discriminator 14))
[15] Object::notification(int, bool) (/home/runner/work/GodotBuilds/GodotBuilds/godot/core/object/object.cpp:792)
[16] SceneTree::_notify_group_pause(StringName const&, int) (/home/runner/work/GodotBuilds/GodotBuilds/godot/scene/main/scene_tree.cpp:868)
[17] SceneTree::process(double) (/home/runner/work/GodotBuilds/GodotBuilds/godot/scene/main/scene_tree.cpp:468)
[18] Main::iteration() (/home/runner/work/GodotBuilds/GodotBuilds/godot/main/main.cpp:3170)
[19] OS_LinuxBSD::run() (/home/runner/work/GodotBuilds/GodotBuilds/godot/platform/linuxbsd/os_linuxbsd.cpp:776)
[20] godot4(main+0x19f) [0x2641a15] (/home/runner/work/GodotBuilds/GodotBuilds/godot/platform/linuxbsd/godot_linuxbsd.cpp:75)
[21] /lib/x86_64-linux-gnu/libc.so.6(+0x29d90) [0x7fcc9ac11d90] (??:0)
[22] /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0x80) [0x7fcc9ac11e40] (??:0)
[23] godot4(_start+0x25) [0x26417b5] (??:?)
-- END OF BACKTRACE --
================================================================

This example was found by Godot fuzzer - Qarminer, so it is quite unlikelly that this code could be used in real project, but still this should be handled gracefully.

Steps to reproduce

Above

Minimal reproduction project

No response