double-free in drag and drop, detected by asan builds

[nyanpasu64]

=================================================================
==17024==ERROR: AddressSanitizer: attempting double-free on 0x1218fddead90 in thread T0:
==17024==WARNING: Failed to use and restart external symbolizer!
    #0 0x7ffa04c433b8 in _asan_wrap_GlobalFree+0xb8 (C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.40.33807\bin\HostX64\x64\clang_rt.asan_dynamic-x86_64.dll+0x1800433b8)
    #1 0x7ffb0e65d18c in ReleaseStgMedium+0xcc (C:\WINDOWS\System32\ole32.dll+0x18000d18c)
    #2 0x7ffa081ecf65  (C:\WINDOWS\SYSTEM32\mfc140.dll+0x18025cf65)
    #3 0x7ffa081ecefd  (C:\WINDOWS\SYSTEM32\mfc140.dll+0x18025cefd)
    #4 0x7ffa0824cd2a  (C:\WINDOWS\SYSTEM32\mfc140.dll+0x1802bcd2a)
    #5 0x7ff6ab1e201e in std::_Ref_count<COleDataSource>::_Destroy C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.40.33807\include\memory:1190
    #6 0x7ff6ab152154 in std::_Ref_count_base::_Decref C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.40.33807\include\memory:1163
    #7 0x7ff6ab1d0ad6 in CFamiTrackerView::BeginDragData C:\Users\user\code\Dn-FamiTracker\Source\FamiTrackerView.cpp:4148
    #8 0x7ff6ab313505 in CPatternEditor::ContinueMouseSelection C:\Users\user\code\Dn-FamiTracker\Source\PatternEditor.cpp:3151
    #9 0x7ff6ab322743 in CPatternEditor::OnMouseMove C:\Users\user\code\Dn-FamiTracker\Source\PatternEditor.cpp:3243
    #10 0x7ff6ab1da1c8 in CFamiTrackerView::OnMouseMove C:\Users\user\code\Dn-FamiTracker\Source\FamiTrackerView.cpp:808
    #11 0x7ffa08227cc0  (C:\WINDOWS\SYSTEM32\mfc140.dll+0x180297cc0)
    #12 0x7ffa082274ee  (C:\WINDOWS\SYSTEM32\mfc140.dll+0x1802974ee)
    #13 0x7ffa08224d0d  (C:\WINDOWS\SYSTEM32\mfc140.dll+0x180294d0d)
    #14 0x7ffa082250d3  (C:\WINDOWS\SYSTEM32\mfc140.dll+0x1802950d3)
    #15 0x7ffa080ca3d8  (C:\WINDOWS\SYSTEM32\mfc140.dll+0x18013a3d8)
    #16 0x7ffb0e1682e0 in DispatchMessageW+0x740 (C:\WINDOWS\System32\USER32.dll+0x1800182e0)
    #17 0x7ffb0e167da0 in DispatchMessageW+0x200 (C:\WINDOWS\System32\USER32.dll+0x180017da0)
    #18 0x7ffa0820dee1  (C:\WINDOWS\SYSTEM32\mfc140.dll+0x18027dee1)
    #19 0x7ffa0820e7f0  (C:\WINDOWS\SYSTEM32\mfc140.dll+0x18027e7f0)
    #20 0x7ffa08240b5f  (C:\WINDOWS\SYSTEM32\mfc140.dll+0x1802b0b5f)
    #21 0x7ff6ab3708e5 in __scrt_common_main_seh D:\a\_work\1\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:288
    #22 0x7ffb0e09257c in BaseThreadInitThunk+0x1c (C:\WINDOWS\System32\KERNEL32.DLL+0x18001257c)
    #23 0x7ffb0ebaaf27 in RtlUserThreadStart+0x27 (C:\WINDOWS\SYSTEM32\ntdll.dll+0x18005af27)

0x1218fddead90 is located 0 bytes inside of 72-byte region [0x1218fddead90,0x1218fddeadd8)
freed by thread T0 here:
    #0 0x7ffa04c433b8 in _asan_wrap_GlobalFree+0xb8 (C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.40.33807\bin\HostX64\x64\clang_rt.asan_dynamic-x86_64.dll+0x1800433b8)
    #1 0x7ff6ab1d0a8e in CFamiTrackerView::BeginDragData C:\Users\user\code\Dn-FamiTracker\Source\FamiTrackerView.cpp:4147
    #2 0x7ff6ab313505 in CPatternEditor::ContinueMouseSelection C:\Users\user\code\Dn-FamiTracker\Source\PatternEditor.cpp:3151
    #3 0x7ff6ab322743 in CPatternEditor::OnMouseMove C:\Users\user\code\Dn-FamiTracker\Source\PatternEditor.cpp:3243
    #4 0x7ff6ab1da1c8 in CFamiTrackerView::OnMouseMove C:\Users\user\code\Dn-FamiTracker\Source\FamiTrackerView.cpp:808
    #5 0x7ffa08227cc0  (C:\WINDOWS\SYSTEM32\mfc140.dll+0x180297cc0)
    #6 0x7ffa082274ee  (C:\WINDOWS\SYSTEM32\mfc140.dll+0x1802974ee)
    #7 0x7ffa08224d0d  (C:\WINDOWS\SYSTEM32\mfc140.dll+0x180294d0d)
    #8 0x7ffa082250d3  (C:\WINDOWS\SYSTEM32\mfc140.dll+0x1802950d3)
    #9 0x7ffa080ca3d8  (C:\WINDOWS\SYSTEM32\mfc140.dll+0x18013a3d8)
    #10 0x7ffb0e1682e0 in DispatchMessageW+0x740 (C:\WINDOWS\System32\USER32.dll+0x1800182e0)
    #11 0x7ffb0e167da0 in DispatchMessageW+0x200 (C:\WINDOWS\System32\USER32.dll+0x180017da0)
    #12 0x7ffa0820dee1  (C:\WINDOWS\SYSTEM32\mfc140.dll+0x18027dee1)
    #13 0x7ffa0820e7f0  (C:\WINDOWS\SYSTEM32\mfc140.dll+0x18027e7f0)
    #14 0x7ffa08240b5f  (C:\WINDOWS\SYSTEM32\mfc140.dll+0x1802b0b5f)
    #15 0x7ff6ab3708e5 in __scrt_common_main_seh D:\a\_work\1\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:288
    #16 0x7ffb0e09257c in BaseThreadInitThunk+0x1c (C:\WINDOWS\System32\KERNEL32.DLL+0x18001257c)
    #17 0x7ffb0ebaaf27 in RtlUserThreadStart+0x27 (C:\WINDOWS\SYSTEM32\ntdll.dll+0x18005af27)

previously allocated by thread T0 here:
    #0 0x7ffa04c43116 in _asan_wrap_GlobalAlloc+0xd6 (C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.40.33807\bin\HostX64\x64\clang_rt.asan_dynamic-x86_64.dll+0x180043116)
    #1 0x7ff6ab1d0983 in CFamiTrackerView::BeginDragData C:\Users\user\code\Dn-FamiTracker\Source\FamiTrackerView.cpp:4120
    #2 0x7ff6ab313505 in CPatternEditor::ContinueMouseSelection C:\Users\user\code\Dn-FamiTracker\Source\PatternEditor.cpp:3151
    #3 0x7ff6ab322743 in CPatternEditor::OnMouseMove C:\Users\user\code\Dn-FamiTracker\Source\PatternEditor.cpp:3243
    #4 0x7ff6ab1da1c8 in CFamiTrackerView::OnMouseMove C:\Users\user\code\Dn-FamiTracker\Source\FamiTrackerView.cpp:808
    #5 0x7ffa08227cc0  (C:\WINDOWS\SYSTEM32\mfc140.dll+0x180297cc0)
    #6 0x7ffa082274ee  (C:\WINDOWS\SYSTEM32\mfc140.dll+0x1802974ee)
    #7 0x7ffa08224d0d  (C:\WINDOWS\SYSTEM32\mfc140.dll+0x180294d0d)
    #8 0x7ffa082250d3  (C:\WINDOWS\SYSTEM32\mfc140.dll+0x1802950d3)
    #9 0x7ffa080ca3d8  (C:\WINDOWS\SYSTEM32\mfc140.dll+0x18013a3d8)
    #10 0x7ffb0e1682e0 in DispatchMessageW+0x740 (C:\WINDOWS\System32\USER32.dll+0x1800182e0)
    #11 0x7ffb0e167da0 in DispatchMessageW+0x200 (C:\WINDOWS\System32\USER32.dll+0x180017da0)
    #12 0x7ffa0820dee1  (C:\WINDOWS\SYSTEM32\mfc140.dll+0x18027dee1)
    #13 0x7ffa0820e7f0  (C:\WINDOWS\SYSTEM32\mfc140.dll+0x18027e7f0)
    #14 0x7ffa08240b5f  (C:\WINDOWS\SYSTEM32\mfc140.dll+0x1802b0b5f)
    #15 0x7ff6ab3708e5 in __scrt_common_main_seh D:\a\_work\1\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:288
    #16 0x7ffb0e09257c in BaseThreadInitThunk+0x1c (C:\WINDOWS\System32\KERNEL32.DLL+0x18001257c)
    #17 0x7ffb0ebaaf27 in RtlUserThreadStart+0x27 (C:\WINDOWS\SYSTEM32\ntdll.dll+0x18005af27)

SUMMARY: AddressSanitizer: double-free (C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.40.33807\bin\HostX64\x64\clang_rt.asan_dynamic-x86_64.dll+0x1800433b8) in _asan_wrap_GlobalFree+0xb8
Address Sanitizer Error: Deallocation of freed memory

Full error details can be found in the Debug Output window