Description:
I tried to copy a selection from one panel to an other and it crashed.
I'm not sure this report is useful but let's try to fix every bugs ;-)

GIMP crashed report:
GNU Image Manipulation Program version 2.10.14
git-describe: GIMP_2_10_12-511-ga4f55d6c7e
C compiler:
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-pc-linux-gnu/9.2.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /build/gcc/src/gcc/configure --prefix=/usr --libdir=/usr/lib --libexecdir=/usr/lib --mandir=/usr/share/man --infodir=/usr/share/info --with-bugurl=https://bugs.archlinux.org/ --enable-languages=c,c++,ada,fortran,go,lto,objc,obj-c++,d --enable-shared --enable-threads=posix --with-system-zlib --with-isl --enable-__cxa_atexit --disable-libunwind-exceptions --enable-clocale=gnu --disable-libstdcxx-pch --disable-libssp --enable-gnu-unique-object --enable-linker-build-id --enable-lto --enable-plugin --enable-install-libiberty --with-linker-hash-style=gnu --enable-gnu-indirect-function --enable-multilib --disable-werror --enable-checking=release --enable-default-pie --enable-default-ssp --enable-cet=auto gdc_include_dir=/usr/include/dlang/gdc
Thread model: posix
gcc version 9.2.0 (GCC)

using babl version 0.1.72 (compiled against version 0.1.72)
using GEGL version 0.4.18 (compiled against version 0.4.18)
using GLib version 2.62.4 (compiled against version 2.62.2)
using GdkPixbuf version 2.40.0 (compiled against version 2.40.0)
using GTK+ version 2.24.32 (compiled against version 2.24.32)
using Pango version 1.44.7 (compiled against version 1.44.7)
using Fontconfig version 2.13.1 (compiled against version 2.13.91)
using Cairo version 1.17.3 (compiled against version 1.17.3)

```
> fatal error: Abandon

Stack trace:
```
/usr/lib/libgimpbase-2.0.so.0(gimp_stack_trace_print+0x3b9)[0x7f00022db3e9]
gimp-2.10(+0xcb4c0)[0x562c63f9a4c0]
gimp-2.10(+0xcb918)[0x562c63f9a918]
gimp-2.10(+0xcbfab)[0x562c63f9afab]
/usr/lib/libpthread.so.0(+0x14930)[0x7f0000f0f930]
/usr/lib/libc.so.6(gsignal+0x145)[0x7f0000d6df25]
/usr/lib/libc.so.6(abort+0x12b)[0x7f0000d57897]
/usr/lib/libc.so.6(+0x25767)[0x7f0000d57767]
/usr/lib/libc.so.6(+0x34526)[0x7f0000d66526]
/usr/lib/libX11.so.6(+0x409f9)[0x7f0000c1b9f9]
/usr/lib/libX11.so.6(+0x40a9e)[0x7f0000c1ba9e]
/usr/lib/libX11.so.6(_XEventsQueued+0x52)[0x7f0000c1bd92]
/usr/lib/libX11.so.6(XPending+0x62)[0x7f0000c0d782]
/usr/lib/libgdk-x11-2.0.so.0(+0x56d27)[0x7f00019f2d27]
/usr/lib/libglib-2.0.so.0(g_main_context_check+0x1d2)[0x7f00010cd8c2]
/usr/lib/libglib-2.0.so.0(+0x6c0c8)[0x7f00010cf0c8]
/usr/lib/libglib-2.0.so.0(g_main_loop_run+0x83)[0x7f00010d00c3]
gimp-2.10(app_run+0x38e)[0x562c63f99c4e]
gimp-2.10(main+0x39a)[0x562c63f994ea]
/usr/lib/libc.so.6(__libc_start_main+0xf3)[0x7f0000d59153]
gimp-2.10(_start+0x2e)[0x562c63f9967e]

```

Steps to reproduce:
I can't reproduce it.

By the way I'm using Wayland.