Disable quick scroll after zooming out

[navimakarov]

After zooming out the pdf scrolls down. Can I disable it?

[Dmitry-Borodin]

I don't see it scrolling down. Please do you see this behaviour in a samples as well?

[navimakarov]

Thank you for the response. I also see this problem on all devices and with sample file as well. When I zoom in and then quickly zoom out it scrolls down. You may see on videos that for example after zooming in 6th page and the quickly zooming out it scrolls down to 20th page or something like that.

1. github sample
   https://drive.google.com/file/d/1D0KnS-nqtG9no5tlwqVUxuVIZvJDUrNB/view?usp=sharing
2. local file
   https://drive.google.com/file/d/1zdXYW_PvAoZqIx07KKgbh3IwM8g9kXlt/view?usp=sharing

[Dmitry-Borodin]

Thank you for reporting this.
I honestly don't know what is the reason and this looks like edge case.
Would be nice to fix it, but I don't expect to find time for it soon.

Please add here any observations that may help to find cause,.
Or if you'll find time to investigate - that would be great.

[navimakarov]

After some testing I found out that the problem is somewhere in this if statement but I have no idea how it works and how to solve it
https://github.com/Dmitry-Borodin/pdfview-android/blob/master/pdfview-android/src/main/java/com/pdfview/subsamplincscaleimageview/SubsamplingScaleImageView.java#L746