[dolphin] [Bug 413939] New: Memory leak on file managers

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https://bugs.kde.org/show_bug.cgi?id=413939

            Bug ID: 413939
           Summary: Memory leak on file managers
           Product: dolphin
           Version: 19.08.2
          Platform: Neon Packages
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: dolphin-bugs-null at kde.org
          Reporter: goliash at goliash.net
                CC: kfm-devel at kde.org
  Target Milestone: ---

Created attachment 123790
  --> https://bugs.kde.org/attachment.cgi?id=123790&action=edit
Heaptrack screenshots

SUMMARY
Dolphin's heap grows in time even if it runs on background and no actions are
done. The same occurs on Krusader. The memory usage grows to gigabytes after
several hours.

STEPS TO REPRODUCE
1. Run Dolphin
2. Wait
3. Mark memory usage
4. Wait more
5. Notice the memory usage is higher
6. Repeat steps 3-5

OBSERVED RESULT
Memory usage grows in time and it doesn't stop at any time

EXPECTED RESULT
Memory usage should remain stable if nothing is happening with application

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: 5.0.0-32
(available in About System)
KDE Plasma Version: 5.17.2
KDE Frameworks Version: 5.63.0
Qt Version: 5.13.1

ADDITIONAL INFORMATION
This has been appearing for months now. The application (Dolphin/Krusader) gets
laggy in time and it has to be restarted to be able to be used.

I am running KDE Neon User Ed. with HWE.

--------------------------------
Process 23931 - dolphin
Summary
The process dolphin (with pid 23931) is using approximately 360.5 MB of memory.
It is using 350.6 MB privately, and a further 74.7 MB that is, or could be,
shared with other programs.
Dividing up the shared memory between all the processes sharing that memory we
get a reduced shared memory usage of 9.8 MB. Adding that to the private usage,
we get the above mentioned total memory footprint of 360.5 MB.
Library Usage
The memory usage of a process is found by adding up the memory usage of each of
its libraries, plus the process's own heap, stack and any other mappings, plus
the stack of its 6 threads. 
Private
more
348808 KB       [heap]
1068 KB /usr/lib/x86_64-linux-gnu/libdolphinprivate.so.5.0.0
888 KB  /usr/lib/x86_64-linux-gnu/dri/i965_dri.so
852 KB  /usr/lib/x86_64-linux-gnu/libkdeinit5_dolphin.so
848 KB  /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5.13.1
Shared
more
13812 KB        /dev/shm/#153 (deleted)
4980 KB /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5.13.1
4644 KB /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5.13.1
4168 KB /usr/lib/x86_64-linux-gnu/libQt5Core.so.5.13.1
2392 KB /usr/lib/x86_64-linux-gnu/dri/i965_dri.so

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