[Libreoffice-bugs] [Bug 135011] New: [Mysterious behavior of animation effect in version 6.2 or later] in impress

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=135011

            Bug ID: 135011
           Summary: [Mysterious behavior of animation effect in version
                    6.2 or later] in impress
           Product: LibreOffice
           Version: 6.4.5.2 release
          Hardware: All
                OS: Linux (All)
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: medium
         Component: Impress
          Assignee: libreoffice-bugs at lists.freedesktop.org
          Reporter: hy531067 at gmail.com

Description:
An object with an animation effect disappears a few steps ago. Even if "Go one
step" is executed, it is not restored, and if "Step back" is repeated several
times, it is restored to some extent. The emphasis effect such as "spin"
disappears or becomes thin after the effect ends. When you use the screen
enlargement function in Linux and execute "Forward" in the enlarged state,
"Forward" progresses abnormally or the page jumps.

Steps to Reproduce:
1.Prepare multiple objects.
2.Give the object an animation effect.
3.For the effect, select something other than "appear" and give a motion path.
4.Depending on the version, it may be improved by hardware acceleration, but
turning this feature on or off does not matter.
5."Go one step" will cause one object to appear as an effect.
6.Occasionally, try "Go Back One".


Actual Results:
While the animation effect is running, the objects around it disappear as if
blinking, and are restored after the effect ends. Not seen in older versions
such as 6.1. Previously, turning hardware acceleration on could help, but the
current stable version doesn't care.
If you press "Return" while playing the presentation even once, the animation
effect does not proceed even if you return from there. In addition, it goes on
in steps.
If you execute "Forward" while expanding the screen with linuxmint, the order
of pages and effects on the screen will be greatly changed.

Expected Results:
Video swap problem?
It's not a memory allocation issue for settings.
A similar situation repeats as the version changes.


Reproducible: Always


User Profile Reset: No



Additional Info:
impress animation strange behavior
Animation behavior Strange behavior 
① Behavior on returning

② Behavior on spin

③ Bug while expanding screen screen

① Apply animation effects to multiple objects "Appear" works normally. Return
the anime effect with "Return". Then, with the "fade etc" effect, the previous
objects that were moved a few times disappear. This is seen in version 6.2 and
above. In the final version of version 6.1, you can play back normally. 

② The object disappears when you spin it with the spin animation. To be
precise, the arc line that is spun becomes so thin that you cannot see it. it.

③ It is assumed that the presentation is being executed by expanding the screen
of the accessibility function with Linux Mint. At this time, if the
magnification is greater than 1 and the presentation is set to “advance” in
that state, the progress is greatly advanced or the next slide is skipped. This
is not seen in version 6.1.

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