Bug#1118401: merkaartor: segfault when hitting download button

[Martin Dosch]

Package: merkaartor
Version: 0.20.0+ds-2+b1
Severity: important

Dear Maintainer,

when starting merkaartor and pressing "Download" it segfaults:

```
LC_ALL=C merkaartor
Detected locale "C" with character encoding "ANSI_X3.4-1968", which is 
not UTF-8.
Qt depends on a UTF-8 locale, and has switched to "C.UTF-8" instead.
If this causes problems, reconfigure your locale. See the locale(1) manual
for more information.
     0.020 (II) [ merk.Main ] ****  "2025-10-19T12:38:07"  -- Starting  "Merkaartor 0.20.0"
     0.020 (II) [ merk.Main ] ------- "using Qt version 6.9.2 (built with 6.8.2)"
     0.020 (II) [ merk.Main ] ------- "using PROJ version 9.7.0"
     0.020 (II) [ merk.Main ] ------- "using GDAL version 3.11.3"
     0.020 (II) [ merk.Main ] ------- with arguments:  QList("merkaartor")
     1.148 (II) [ merk.Main ] Loading plugins from directory  "/usr/lib/merkaartor/plugins"
     1.148 (II) [ merk.Main ] Loading plugins from directory  "/usr/lib/merkaartor/plugins/background"
     1.165 (DD) [ default ]   missing
     1.165 (DD) [ default ]   missing
     1.165 (DD) [ default ]   missing
     1.165 (DD) [ default ]   missing
     1.165 (DD) [ default ]   missing
     1.165 (II) [ merk.Main ]   Plugin loaded:  "libMGdalBackgroundPlugin.so" .
     1.168 (II) [ merk.Main ]   Plugin loaded:  "libMGeoTiffBackgroundPlugin.so" .
     1.170 (II) [ merk.Main ]   Plugin loaded:  "libMMsBingMapBackgroundPlugin.so" .
     1.202 (DD) [ default ] Looking for translations file:  "qt_C"
     1.202 (DD) [ default ]   Trying directory  "/usr/share/merkaartor/translations"
     1.202 (DD) [ default ]   Trying directory  "/usr/bin"
     1.202 (DD) [ default ]   Trying directory  "/usr/bin/translations"
     1.202 (DD) [ default ]   Trying directory  "/usr/share/qt6/translations"
     1.203 (DD) [ default ]   Not found.
     1.203 (DD) [ default ] Looking for translations file:  "merkaartor_C"
     1.203 (DD) [ default ]   Trying directory  "/usr/share/merkaartor/translations"
     1.203 (DD) [ default ]   Trying directory  "/usr/bin"
     1.203 (DD) [ default ]   Trying directory  "/usr/bin/translations"
     1.203 (DD) [ default ]   Trying directory  "/usr/share/qt6/translations"
     1.204 (DD) [ default ]   Not found.
     1.237 (WW) [ qt.core.qobject.connect ] QObject::connect: No such slot FeaturesDock::on_Viewport_changed()
     1.238 (WW) [ qt.core.qobject.connect ] QObject::connect:  (receiver name: 'FeaturesDock')
     1.238 (WW) [ qt.core.qobject.connect ] QObject::connect: No such slot FeaturesDock::on_Viewport_changed()
     1.238 (WW) [ qt.core.qobject.connect ] QObject::connect:  (sender name:   'MainWindow')
     1.238 (WW) [ qt.core.qobject.connect ] QObject::connect:  (receiver name: 'FeaturesDock')
     1.313 (DD) [ default ] Created layer "Background imagery"
     1.314 (DD) [ default ] Created layer "Drawing layer #0"
[1]    174785 segmentation fault  LC_ALL=C merkaartor
```

-- System Information:
Debian Release: forky/sid
  APT prefers testing
  APT policy: (900, 'testing'), (600, 'unstable'), (500, 'unstable-debug'), (500, 'testing-debug'), (500, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 6.16.9+deb14-amd64 (SMP w/8 CPU threads; PREEMPT)
Locale: LANG=de_DE.UTF-8, LC_CTYPE=de_DE.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages merkaartor depends on:
ii  libc6                2.41-12
ii  libexiv2-28          0.28.7+dfsg-2
ii  libgcc-s1            15.2.0-4
ii  libgdal37            3.11.4+dfsg-1
ii  libproj25            9.7.0-1
ii  libprotobuf32t64     3.21.12-14
ii  libproxy1v5          0.5.11-2
ii  libqt6concurrent6    6.9.2+dfsg-2
ii  libqt6core5compat6   6.9.2-2
ii  libqt6core6t64       6.9.2+dfsg-2
ii  libqt6gui6           6.9.2+dfsg-2
ii  libqt6network6       6.9.2+dfsg-2
ii  libqt6networkauth6   6.9.2-2
ii  libqt6printsupport6  6.9.2+dfsg-2
ii  libqt6svg6           6.9.2-4
ii  libqt6widgets6       6.9.2+dfsg-2
ii  libqt6xml6           6.9.2+dfsg-2
ii  libstdc++6           15.2.0-4
ii  zlib1g               1:1.3.dfsg+really1.3.1-1+b1

merkaartor recommends no packages.

merkaartor suggests no packages.

-- no debconf information
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