[okular] [Bug 470174] New: 40 Characters Annotation consuming 20MB

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https://bugs.kde.org/show_bug.cgi?id=470174

            Bug ID: 470174
           Summary: 40 Characters Annotation consuming 20MB
    Classification: Applications
           Product: okular
           Version: 23.04.1
          Platform: Archlinux
                OS: Linux
            Status: REPORTED
          Severity: grave
          Priority: NOR
         Component: general
          Assignee: okular-devel at kde.org
          Reporter: der.wolfgang.amadeus.mozart at gmx.at
  Target Milestone: ---

Created attachment 159208
  --> https://bugs.kde.org/attachment.cgi?id=159208&action=edit
File with one comment with text  "a" - original size ~80kb now 2MB!

I commented a file with a few characters. Initially the file had ~ 80KB. With
the annotations ~20MB and Okular had an excessive CPU consumption (100% of a
core - should be 1 Thread that behaves strange) The CPU consumtion starts when
scrolling. With 12 comments my file was lagging on scroll.  When comment is
deleted, file keeps memory consumption.

Tried it with some other files. About 4MB for one comment with a few characters
like "aspofksdfjdsafjfsadpfg"!

EXPECTED RESULT
Annotations to consume < 10KB for text only per comment and use 0.01% of CPU.
The file should have the original size after deletion of comments.

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: 
(available in About System)
KDE Plasma Version: 
KDE Frameworks Version: 
Qt Version: 

ADDITIONAL INFORMATION

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