Bug#992918: gwenview: fails to save jpg/jpeg image

[Fufu Fang <fangfufu@fangfufu.co.uk>]

Package: gwenview
Version: 4:20.12.3-2
Severity: normal

Dear Maintainer,
I opened an image in Gwenview (it can be any format), then I go to the "File"
menu, and click on the "Save As..." menu option. If I select "JPEG image" as
the file type, then press the "Save" button, two modal dialogs pop up.

One dialog has the title "Error -- Gwenview", with the text "Unsupported image
format".

The other dialog has the title "Warning -- Gwenview", with the text "Saving
'xxxxx.jpg' failed: Unspported image format". I am offered to save it as
another format.


-- System Information:
Debian Release: 11.0
  APT prefers stable-security
  APT policy: (500, 'stable-security'), (500, 'stable')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 5.10.0-8-amd64 (SMP w/8 CPU threads)
Kernel taint flags: TAINT_PROPRIETARY_MODULE, TAINT_CPU_OUT_OF_SPEC,
TAINT_CRAP, TAINT_OOT_MODULE, TAINT_UNSIGNED_MODULE
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8), LANGUAGE=en_GB
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages gwenview depends on:
ii  kinit                  5.78.0-2
ii  kio                    5.78.0-5
ii  libc6                  2.31-13
ii  libcfitsio9            3.490-3
ii  libexiv2-27            0.27.3-3+deb11u1
ii  libgcc-s1              10.2.1-6
ii  libjpeg62-turbo        1:2.0.6-4
ii  libkf5activities5      5.78.0-2
ii  libkf5baloo5           5.78.0-3
ii  libkf5completion5      5.78.0-3
ii  libkf5configcore5      5.78.0-4
ii  libkf5configgui5       5.78.0-4
ii  libkf5configwidgets5   5.78.0-2
ii  libkf5coreaddons5      5.78.0-4
ii  libkf5filemetadata3    5.78.0-2
ii  libkf5i18n5            5.78.0-2
ii  libkf5iconthemes5      5.78.0-2
ii  libkf5itemmodels5      5.78.0-2
ii  libkf5itemviews5       5.78.0-2
ii  libkf5jobwidgets5      5.78.0-2
ii  libkf5kdcraw5          20.12.0-1
ii  libkf5kiocore5         5.78.0-5
ii  libkf5kiofilewidgets5  5.78.0-5
ii  libkf5kiowidgets5      5.78.0-5
ii  libkf5kipi32.0.0       4:20.12.1-1
ii  libkf5notifications5   5.78.0-2
ii  libkf5parts5           5.78.0-3
ii  libkf5purpose-bin      5.78.0-2
ii  libkf5purpose5         5.78.0-2
ii  libkf5service-bin      5.78.0-2
ii  libkf5service5         5.78.0-2
ii  libkf5solid5           5.78.0-2
ii  libkf5widgetsaddons5   5.78.0-2
ii  libkf5xmlgui5          5.78.0-2
ii  liblcms2-2             2.12~rc1-2
ii  libphonon4qt5-4        4:4.11.1-4
ii  libpng16-16            1.6.37-3
ii  libqt5core5a           5.15.2+dfsg-9
ii  libqt5dbus5            5.15.2+dfsg-9
ii  libqt5gui5             5.15.2+dfsg-9
ii  libqt5printsupport5    5.15.2+dfsg-9
ii  libqt5svg5             5.15.2-3
ii  libqt5widgets5         5.15.2+dfsg-9
ii  libqt5x11extras5       5.15.2-2
ii  libstdc++6             10.2.1-6
ii  libtiff5               4.2.0-1
ii  libx11-6               2:1.7.2-1
ii  perl                   5.32.1-4+deb11u1
ii  phonon4qt5             4:4.11.1-4

Versions of packages gwenview recommends:
ii  kamera                     4:20.12.0-1
pn  kio-extras                 <none>
ii  qt5-image-formats-plugins  5.15.2-2

gwenview suggests no packages.