Dragging MacVim tab overlapping the title bar results in a crash [UI]

[salvosq]

Steps to reproduce

1. Create multiple editor tabs (cmd+t)
2. Drag one of them overlapping the title bar.

Expected behaviour

I need to move tabs for reordering purposes.

Version of Vim and architecture

9.1.0 (179)

Environment

Process: MacVim [28974]
Path: /Applications/MacVim.app/Contents/MacOS/MacVim
Identifier: org.vim.MacVim
Version: 9.1.0 (179)
Code Type: X86-64 (Native)
Parent Process: Vim [28973]
Date/Time: 2024-01-08 14:55:40.3414 +0100
OS Version: macOS 14.2.1 (23C71)
Report Version: 12

How MacVim was installed

From https://macvim.org/

Logs and stack traces

Exception Type:        EXC_BAD_ACCESS (SIGSEGV)
Exception Codes:       KERN_INVALID_ADDRESS at 0x000042f2965f177e
Exception Codes:       0x0000000000000001, 0x000042f2965f177e
Termination Reason:    Namespace SIGNAL, Code 11 Segmentation fault: 11
Terminating Process:   exc handler [28974]

Vim configuration where issue is reproducable

No response

Issue has been tested with given configuration

• by running MacVim.app from GUI macOS interface
• by running vim/gvim/etc installed by MacVim
• by running other versions of vim (e.g. /usr/bin/vim)

Issue has been tested with no configuration

• by running mvim --clean (or gvim, supplied by MacVim distribution)
• by running vim --clean (in terminal, supplied by MacVim distribution)
• by running vim --clean (in terminal, other suppliers, e.g. /usr/bin/vim)

Other conditions

• The both Homebrew packages "vim" and "macvim" are installed

[ychin]

I could reproduce this issue. Looking into it. Will try to push out an update soon after investigation and fix.