[okular] [Bug 435246] New: Okular Crashing While Opening pdf file with annotations

[Jason Liam]

https://bugs.kde.org/show_bug.cgi?id=435246

            Bug ID: 435246
           Summary: Okular Crashing While Opening pdf file with
                    annotations
           Product: okular
           Version: unspecified
          Platform: Ubuntu Packages
                OS: Linux
            Status: REPORTED
          Severity: crash
          Priority: NOR
         Component: general
          Assignee: okular-devel at kde.org
          Reporter: jlame646 at gmail.com
  Target Milestone: ---

Created attachment 137256
  --> https://bugs.kde.org/attachment.cgi?id=137256&action=edit
No review F6 option t

Hi i am used to working with pdfs in Okular. And everything was working fine
but suddenly okular is not able to open the pdf file that i regularly make
changes to. For example,just this morning i used okular to open my pdf file and
added some annotations and stuff. And then after saving the file i closed the
file. Now( afternoon) when i am trying to open the same file in okular, the
file is not opening and i am getting the option to either force quit the app or
wait. This is happening with this pdf only. Other pdfs are openings correctly.
Also, the same pdf is also not opening in Document Viewer. Note that the size
of the pdf is around 68 MB.Is there a way to see what is going wrong?, like
debug okular. Also i installed okular through Ubuntu Software center. I am
using Ubuntu 18.04. I have used okular regularly on the same file for a long
time and i have never faced any issues but only today i am not able to open the
file? How can i resolve this? Now i uninstalled okular by going to ubuntu
software and then reinstalled it from there. But now i am facing one additional
problem. Now there is no option to even annotate. Before there was F6 shortcut
or we can go to Tools->Review but now F6 is not working, i am attaching the
screenshot of this. Also the same old pdf is still not opening. Why is this
issue happeing and how can i resolve this? I have very important annotations in
the concerned pdfs. 
As you can see in the screenshot the review option is not selectable. Now i
opened the same pdf file with okular and waited for a long time(around 1 hour)
and noticed that some part(very little) like some annotations and other things
are starting to appear. So why suddenly okular is not able to load the
annotations and other things for this file? That is why is it taking so much
time to load the annotations corresponding to this file?

Edit: I guess i know what is the issue. The original file(without any
annotations) is of size 50 MB and my annotated version is of 68 MB. So the
problem seems to be with the large size of the file. For example i had saved a
previous version of the same file(with annotations) which was of size 59 MB and
okular is able to open that file correctly. But okular is not able to open the
68 MB file, i think the problem is with the too much annotations(around 18MB).
How can i resolve this problem? I guess my final question is can i revert back
the changes that i made today. Because in the morning the file and okular both
seems to be working correctly. After adding some annotations the file size got
larger and stopped working so i guess if i can delete the annotations that i
made today i can still use the file. For this i will need to know where are
those annotations files saved. And also in which format so that i can either
delete or edit them accordingly. Also note that there is no F6 or review option
in the newly downloaded version  of okular to add annotations.

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