Bug#991726: the mask bug

[fantasma shy]

```
GNU Image Manipulation Program version 2.10.8
git-describe: GIMP_2_10_6-294-ga967e8d2c2
C compiler:
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/8/lto-wrapper
OFFLOAD_TARGET_NAMES=nvptx-none
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Debian 8.2.0-13'
--with-bugurl=file:///usr/share/doc/gcc-8/README.Bugs
--enable-languages=c,ada,c++,go,brig,d,fortran,objc,obj-c++ --prefix=/usr
--with-gcc-major-version-only --program-suffix=-8
--program-prefix=x86_64-linux-gnu- --enable-shared --enable-linker-build-id
--libexecdir=/usr/lib --without-included-gettext --enable-threads=posix
--libdir=/usr/lib --enable-nls --enable-clocale=gnu
--enable-libstdcxx-debug --enable-libstdcxx-time=yes
--with-default-libstdcxx-abi=new --enable-gnu-unique-object
--disable-vtable-verify --enable-libmpx --enable-plugin
--enable-default-pie --with-system-zlib --with-target-system-zlib
--enable-objc-gc=auto --enable-multiarch --disable-werror
--with-arch-32=i686 --with-abi=m64 --with-multilib-list=m32,m64,mx32
--enable-multilib --with-tune=generic --enable-offload-targets=nvptx-none
--without-cuda-driver --enable-checking=release --build=x86_64-linux-gnu
--host=x86_64-linux-gnu --target=x86_64-linux-gnu
Thread model: posix
gcc version 8.2.0 (Debian 8.2.0-13)

using GEGL version 0.4.12 (compiled against version 0.4.12)
using GLib version 2.58.3 (compiled against version 2.58.1)
using GdkPixbuf version 2.38.1 (compiled against version 2.38.0)
using GTK+ version 2.24.32 (compiled against version 2.24.32)
using Pango version 1.42.3 (compiled against version 1.42.3)
using Fontconfig version 2.13.1 (compiled against version 2.13.1)
using Cairo version 1.16.0 (compiled against version 1.16.0)

```
> fatal error: Abortado

Stack trace:
```
/usr/lib/libgimpbase-2.0.so.0(gimp_stack_trace_print+0x397)[0x7ceff22b8e27]
gimp-2.10(+0xd14a0)[0x5cbbe91f14a0]
gimp-2.10(+0xd18d8)[0x5cbbe91f18d8]
gimp-2.10(+0xd2037)[0x5cbbe91f2037]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x12730)[0x7ceff15c0730]
/lib/x86_64-linux-gnu/libc.so.6(gsignal+0x10b)[0x7ceff14227bb]
/lib/x86_64-linux-gnu/libc.so.6(abort+0x121)[0x7ceff140d535]
/lib/x86_64-linux-gnu/libc.so.6(+0x2240f)[0x7ceff140d40f]
/lib/x86_64-linux-gnu/libc.so.6(+0x30102)[0x7ceff141b102]
/usr/lib/x86_64-linux-gnu/libX11.so.6(+0x4370b)[0x7ceff12e770b]
/usr/lib/x86_64-linux-gnu/libX11.so.6(+0x437b0)[0x7ceff12e77b0]
/usr/lib/x86_64-linux-gnu/libX11.so.6(_XEventsQueued+0x5d)[0x7ceff12e7aad]
/usr/lib/x86_64-linux-gnu/libX11.so.6(XPending+0x57)[0x7ceff12d9747]
/usr/lib/x86_64-linux-gnu/libgdk-x11-2.0.so.0(+0x588d5)[0x7ceff23798d5]
/usr/lib/x86_64-linux-gnu/libglib-2.0.so.0(g_main_context_check+0x1d1)[0x7ceff17a4b11]
/usr/lib/x86_64-linux-gnu/libglib-2.0.so.0(+0x4e0e0)[0x7ceff17a50e0]
/usr/lib/x86_64-linux-gnu/libglib-2.0.so.0(g_main_loop_run+0xb2)[0x7ceff17a54c2]
gimp-2.10(app_run+0x357)[0x5cbbe91f0cb7]
gimp-2.10(main+0x395)[0x5cbbe91f05b5]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xeb)[0x7ceff140f09b]
gimp-2.10(_start+0x2a)[0x5cbbe91f073a]

```
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