Freeze when importing files

[tomasantunes]

Godot version:

4.0 766c6db

OS/device including version:
Windows 10

Issue description:
Editor freezes when importing files.

Steps to reproduce:

1. Create new project
2. Drag and drop files from folder to FileSystem tab.

[qarmin]

Looks that something corrupt underlying memory.
For me importing 1000 images causes it - FF2.zip

Address sanitizer

ERROR: Condition "p_node == _data._nil && p_color == RED" is true.
   at: _set_color (./core/templates/set.h:121)
ERROR: Condition "p_node == _data._nil && p_color == RED" is true.
   at: _set_color (./core/templates/set.h:121)
==430245==ERROR: AddressSanitizer: global-buffer-overflow on address 0x00005013ea00 at pc 0x00000219d0ca bp 0x7f6141828040 sp 0x7f6141828030
WRITE of size 8 at 0x00005013ea00 thread T54
    #0 0x219d0c9 in Set<String, Comparator<String>, DefaultAllocator>::_insert(String const&) core/templates/set.h:330
    #1 0x2194ebb in Set<String, Comparator<String>, DefaultAllocator>::insert(String const&) core/templates/set.h:514
    #2 0x9e5ccb1 in EditorFileSystem::_reimport_file(String const&, Map<StringName, Variant, Comparator<StringName>, DefaultAllocator> const*, String const&) editor/editor_file_system.cpp:1728
    #3 0x9e69770 in EditorFileSystem::_reimport_thread(unsigned int, EditorFileSystem::ImportThreadData*) editor/editor_file_system.cpp:1933
    #4 0x9eb106b in ThreadWorkPool::Work<EditorFileSystem, void (EditorFileSystem::*)(unsigned int, EditorFileSystem::ImportThreadData*), EditorFileSystem::ImportThreadData*>::work() core/templates/thread_work_pool.h:61
    #5 0x1620db07 in ThreadWorkPool::_thread_function(void*) core/templates/thread_work_pool.cpp:42
    #6 0x14fac1a4 in Thread::callback(Thread*, Thread::Settings const&, void (*)(void*), void*) core/os/thread.cpp:72
    #7 0x14fb0319 in void std::__invoke_impl<void, void (*)(Thread*, Thread::Settings const&, void (*)(void*), void*), Thread*, Thread::Settings, void (*)(void*), void*>(std::__invoke_other, void (*&&)(Thread*, Thread::Settings const&, void (*)(void*), void*), Thread*&&, Thread::Settings&&, void (*&&)(void*), void*&&) /usr/include/c++/10/bits/invoke.h:60
    #8 0x14fafbe7 in std::__invoke_result<void (*)(Thread*, Thread::Settings const&, void (*)(void*), void*), Thread*, Thread::Settings, void (*)(void*), void*>::type std::__invoke<void (*)(Thread*, Thread::Settings const&, void (*)(void*), void*), Thread*, Thread::Settings, void (*)(void*), void*>(void (*&&)(Thread*, Thread::Settings const&, void (*)(void*), void*), Thread*&&, Thread::Settings&&, void (*&&)(void*), void*&&) /usr/include/c++/10/bits/invoke.h:95
    #9 0x14faf74f in void std::thread::_Invoker<std::tuple<void (*)(Thread*, Thread::Settings const&, void (*)(void*), void*), Thread*, Thread::Settings, void (*)(void*), void*> >::_M_invoke<0ul, 1ul, 2ul, 3ul, 4ul>(std::_Index_tuple<0ul, 1ul, 2ul, 3ul, 4ul>) /usr/include/c++/10/thread:264
    #10 0x14faf3e6 in std::thread::_Invoker<std::tuple<void (*)(Thread*, Thread::Settings const&, void (*)(void*), void*), Thread*, Thread::Settings, void (*)(void*), void*> >::operator()() /usr/include/c++/10/thread:271
    #11 0x14faf39e in std::thread::_State_impl<std::thread::_Invoker<std::tuple<void (*)(Thread*, Thread::Settings const&, void (*)(void*), void*), Thread*, Thread::Settings, void (*)(void*), void*> > >::_M_run() /usr/include/c++/10/thread:215
    #12 0x174e41e3 in execute_native_thread_routine (/usr/bin/godot4s+0x174e41e3)
    #13 0x7f618612644f in start_thread nptl/pthread_create.c:473
    #14 0x7f618557fd52 in clone (/lib/x86_64-linux-gnu/libc.so.6+0x117d52)

0x00005013ea00 is located 0 bytes to the right of global variable '_nil' defined in 'core/os/memory.cpp:200:12' (0x5013e9e0) of size 32
SUMMARY: AddressSanitizer: global-buffer-overflow core/templates/set.h:330 in Set<String, Comparator<String>, DefaultAllocator>::_insert(String const&)
Shadow bytes around the buggy address:
  0x00008a01fcf0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 f9
  0x00008a01fd00: f9 f9 f9 f9 00 00 00 00 00 00 00 f9 f9 f9 f9 f9
  0x00008a01fd10: 00 f9 f9 f9 f9 f9 f9 f9 01 f9 f9 f9 f9 f9 f9 f9
  0x00008a01fd20: 00 00 00 00 00 f9 f9 f9 f9 f9 f9 f9 00 f9 f9 f9
  0x00008a01fd30: f9 f9 f9 f9 00 f9 f9 f9 f9 f9 f9 f9 00 00 00 00
=>0x00008a01fd40:[f9]f9 f9 f9 00 00 00 00 01 f9 f9 f9 f9 f9 f9 f9
  0x00008a01fd50: 00 f9 f9 f9 f9 f9 f9 f9 00 00 00 00 00 f9 f9 f9
  0x00008a01fd60: f9 f9 f9 f9 00 f9 f9 f9 f9 f9 f9 f9 00 f9 f9 f9
  0x00008a01fd70: f9 f9 f9 f9 00 00 00 00 00 f9 f9 f9 f9 f9 f9 f9
  0x00008a01fd80: 00 f9 f9 f9 f9 f9 f9 f9 00 f9 f9 f9 f9 f9 f9 f9
  0x00008a01fd90: 00 f9 f9 f9 f9 f9 f9 f9 01 f9 f9 f9 f9 f9 f9 f9
Shadow byte legend (one shadow byte represents 8 application bytes):
  Addressable:           00
  Partially addressable: 01 02 03 04 05 06 07 
  Heap left redzone:       fa
  Freed heap region:       fd
  Stack left redzone:      f1
  Stack mid redzone:       f2
  Stack right redzone:     f3
  Stack after return:      f5
  Stack use after scope:   f8
  Global redzone:          f9
  Global init order:       f6
  Poisoned by user:        f7
  Container overflow:      fc
  Array cookie:            ac
  Intra object redzone:    bb
  ASan internal:           fe
  Left alloca redzone:     ca
  Right alloca redzone:    cb
  Shadow gap:              cc
Thread T54 created by T0 here:
    #0 0x7f61863b16d5 in __interceptor_pthread_create ../../../../src/libsanitizer/asan/asan_interceptors.cpp:216
    #1 0x174e44a8 in std::thread::_M_start_thread(std::unique_ptr<std::thread::_State, std::default_delete<std::thread::_State> >, void (*)()) (/usr/bin/godot4s+0x174e44a8)
    #2 0x14fac694 in Thread::start(void (*)(void*), void*, Thread::Settings const&) core/os/thread.cpp:88
    #3 0x1620e6e0 in ThreadWorkPool::init(int) core/templates/thread_work_pool.cpp:58
    #4 0x9e7675d in EditorFileSystem::EditorFileSystem() editor/editor_file_system.cpp:2193
    #5 0xa23ff92 in EditorNode::EditorNode() editor/editor_node.cpp:5851
    #6 0x217db94 in Main::start() main/main.cpp:2151
    #7 0x2024f74 in main platform/linuxbsd/godot_linuxbsd.cpp:57
    #8 0x7f6185490564 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x28564)

[lyuma]

@tomasantunes your issue is addressed in #49682
@qarmin your issue is addressed in #49683