https://bugs.kde.org/show_bug.cgi?id=402714

            Bug ID: 402714
           Summary: DigiKam crash using "create stacked images" several
                    times on 25 images from the same folder
           Product: digikam
           Version: 5.9.0
          Platform: Manjaro
                OS: Linux
            Status: REPORTED
          Severity: crash
          Priority: NOR
         Component: Export-ExpoBlending
          Assignee: digikam-bugs-n...@kde.org
          Reporter: cd.graes...@gmail.com
  Target Milestone: ---

SUMMARY
Digikam crashes completely due to a bug in the digikam interface to the
menu/extra/create stacked images GUI.

I am stacking 25 jpeg images with each 16Mpix. 

The tool can not be used several times, because the output file can not be
created due to conflict with previous file name. The name is not changed
automatically. 

Workaround is to manually change the output filename before closing the GUI


STEPS TO REPRODUCE
0. mark 15 images in one folder
1. menu/extra/create stacked images GUI
2. in the last GUI where the output file is specified: check the box "save
under new name" type the filename, used both jpeg and png output.
3. press preview and save, then close
4. all works fine until you use the same procedure again inside the same folder
4.a. crash in the third GUI frame (? when transferring the data into
enfuse/enblend) 
5. it can be repaired by using a in a new folder a different set of images. or
just a few images. I do not know where the max number of images is that can be
stacked. My 8GB RAM is not filled with 25 images.



OBSERVED RESULT
crash of full digikam


EXPECTED RESULT
the filename would just be changed to filename(1) and then filename(2)

WORKARROUND
Change Filename to a new one before closing the save GUI


SOFTWARE/OS VERSIONS
Betriebssystem: Manjaro Linux 
KDE-Plasma-Version: 5.14.4
Qt-Version: 5.11.2
KDE-Frameworks-Version: 5.52.0
Kernel-Version: 4.19.12-2-MANJARO
Art des Betriebssystems: 64-bit
Prozessoren: 4 × Intel® Core™ i5-4210U CPU @ 1.70GHz
Speicher: 7,7 GiB Arbeitsspeicher


ADDITIONAL INFORMATION

Screenshots here:
https://docs.google.com/document/d/12xCExoFFBrp5rcFWkkuX8tvHiKZSIIs8rTjxBL78pDw/edit?usp=sharing

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