Clicking outside columns in TCP tab of Statistics -> Conversations window causes crash
## Summary
Running Wireshark Version 4.4.3 (v4.4.3-0-g66d7a52feb06).
Open the menu item Statistics-->Conversations. On the TCP tab, widen the window enough that there is white space next to the right-most column. Right-click in the white space just to the right of the last column. Wireshark spins for a second and then crashes.
## Sample capture file
Happens for me on multiple capture files. Not sure I can share them as they are with my customer. I may be able to get a snippet.
## Steps to reproduce
Open the menu item Statistics-->Conversations. On the TCP tab, widen the window enough that there is white space next to the right-most column. Right-click in the white space just to the right of the last column. Wireshark spins for a second and then crashes.
## What is the current bug behavior?
Wireshark crashes, all windows close.
## What is the expected correct behavior?
A selector which allows me to choose other columns. In fact, I was trying to see if I could add Start Time of the stream so that I can sort TCP connections chronologically. So this is a bug report and a feature enhancement. Thanks.
## Build information
```
(In Wireshark, select Help->About Wireshark from the main menu and use the button "Copy To Clipboard".
Please paste the complete output here. Or from the command line, run `tshark -v` or `wireshark -v`)
```
TShark (Wireshark) 4.4.3 (v4.4.3-0-g66d7a52feb06).
Copyright 1998-2025 Gerald Combs <gerald@wireshark.org> and contributors.
Licensed under the terms of the GNU General Public License (version 2 or later).
This is free software; see the file named COPYING in the distribution. There is
NO WARRANTY; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
Compiled (64-bit) using Microsoft Visual Studio 2022 (VC++ 14.41, build 34123),
with GLib 2.78.4, with libpcap, with zlib 1.3.1, with zlib-ng 2.1.5, with PCRE2,
with Lua 5.4.6 (with UfW patches), with GnuTLS 3.8.4 and PKCS #11 support, with
Gcrypt 1.10.2-unknown, with Kerberos (MIT), with MaxMind, with nghttp2 1.62.1,
with nghttp3 0.14.0, with brotli, with LZ4, with Zstandard, with Snappy, with
libxml2 2.11.7, with libsmi 0.5.0, with binary plugins.
Running on 64-bit Windows 11 (23H2), build 22631, with 11th Gen Intel(R)
Core(TM) i9-11950H @ 2.60GHz (with SSE4.2), with 65199 MB of physical memory,
with GLib 2.78.4, with Npcap version 1.75, based on libpcap version 1.10.4, with
PCRE2 10.43 2024-02-16, with c-ares 1.27.0, with GnuTLS 3.8.4, with Gcrypt
1.10.2-unknown, with nghttp2 1.62.1, with nghttp3 0.14.0, with brotli 1.0.9,
with LZ4 1.9.4, with Zstandard 1.5.6, with LC_TYPE=English_United States.utf8,
binary plugins supported.
issue