Bug 1384164

Summary: Back button takes you forward a few slides
Product: [Fedora] Fedora Reporter: Jonathan Dieter <jdieter>
Component: libreofficeAssignee: Caolan McNamara <caolanm>
Status: CLOSED EOL QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: unspecified Docs Contact:
Priority: unspecified    
Version: 24CC: caolanm, dtardon, erack, mstahl, sbergman
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Last Closed: 2017-08-08 19:24:24 UTC Type: Bug
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Description Flags
Test case presentation
none
Original PPT none

Description Jonathan Dieter 2016-10-12 17:20:05 UTC
Created attachment 1209680 [details]
Test case presentation

Description of problem:
With this presentation (originally imported from Powerpoint, I think), pressing back on certain slides actually skips a few

Version-Release number of selected component (if applicable):
libreoffice-impress-5.1.5.2-9.fc24.x86_64

How reproducible:
Always

Steps to Reproduce:
1. Open presentation
2. Go to Slide 13
3. Press the left arrow button

Actual results:
You're now on slide 18

Expected results:
You should be on slide 12

Comment 1 David Tardon 2016-10-13 17:42:47 UTC
The rewind to the previous slide ultimately gets into slideshow::EffectRewinder::asynchronousRewind(), which calls skipSingleMainSequenceEffects() as many times as there is effects on the slide. But this function causes--indirectly, of course--insertion of notifySlideEnded signal to the event queue. Unfortunately it also calls slideshow::internal::EventQueue::forceEmpty (a second level here), which immediately handles that event and moves to the next slide... (The presenation is already on slide 12 at that point and there is 6 effects on that slide, so the net effect is 6 moves forward--to slide 18.)

But the problem appears to be trigerred by something--most likely the animation settings--in this presentation, because I cannot reproduce it playing with a freshly made one.

Comment 2 Jonathan Dieter 2016-10-13 18:17:27 UTC
I don't know if this is related, but I can't actually see or edit any effects in slide 12.   There's a little "effects" icon next to the slide in the Slide Plane, but when going to Custom Animation, no effects show up.

The teacher who's working with this file started with a pptx, did quite a bit of reformatting to fit her lesson plan, and then saved as an odp.  I wonder if the animations are still technically there, even though the objects they were animating are now gone.

Comment 3 David Tardon 2016-10-18 08:20:51 UTC
Btw, there is more interesting stuff in that ODF file. E.g., almost all text on the first ~10 slides is split into small--mostly single-letter--spans with the same style. I really wonder how this happened...

Comment 4 Jonathan Dieter 2016-10-19 09:39:10 UTC
Created attachment 1212099 [details]
Original PPT

I don't know if this helps, but this was the original PPT that the teacher started with.  She removed a number of slides, converted most of the formulas in the first few slides to the LibreOffice formula format because sigmas were appearing as question marks in a black diamond, and removed most (if not all) of the animations.

This teacher has twenty or so presentations that she went through this process with, so we have more examples if they would help.

Comment 5 Fedora End Of Life 2017-07-25 23:27:02 UTC
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Comment 6 Fedora End Of Life 2017-08-08 19:24:24 UTC
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