PDF scrolling with mouse wheel not working

[shenhavba]

Bug Report

What version of the product are you using?

CefSharp.Common, CefSharp.Wpf all version 55

What version are you using? Nuget? CI Nuget? build from a branch? If so which branch? e.g. 53.0.1
What architecture x86 or x64?

build from branch 55.0.0-pre01 - x86

On what operating system?

windows 10

Are you using WinForms, WPF or OffScreen?

wpf

What steps will reproduce the problem?

 1. open pdf with a lot of pages.
 2.try to scroll with the mouse, nothing happens for few seconds and then, the pages jump to the last page           

Please provide detailed information here, enough for someone else to reprodce your problem.
Please no binary (zip, etc) links, fork the MinimalExample and push your changes to GitHub. (Alternatively use a code sharing service list Gist or Pastebin).
What is the expected output? What do you see instead?

The expected behavior is good scrolling, page by page but the scrolling causing the pages to jump to the last one.
Its working fine in version 47.

Does this problem also occur in the CEF Sample Application from http://opensource.spotify.com/cefbuilds/index.html?

No.

[merceyz]

https://github.com/cefsharp/CefSharp/blob/master/ISSUE_TEMPLATE.md

[amaitland]

It's interesting to note that scrolling with the scrollbar is working fine.

Does this problem also occur in the CEF Sample Application from http://opensource.spotify.com/cefbuilds/index.html?

No.

Please verify the command line args you used when tested with cefclient, it's very important they're the ones listed for WPF. If this reproduces with the command line args specified for comparing to WPF, then someone will need to dig into this further, I guess starting with comparing the mouse wheel code.

If you have time, please investigate this further. The cefclient code is available at https://bitbucket.org/chromiumembedded/cef/src/9d48a4f80e2ba30bb3ddaf97f9e7c34e670c22a7/tests/cefclient/?at=master

[amaitland]

@shenhavba Did you actually test with cefclient --multi-threaded-message-loop --off-screen-rendering-enabled???? I'm seeing the same problem reproduce....

[amaitland]

https://bitbucket.org/chromiumembedded/cef/issues/2078/osr-pdf-scrolling-with-mousewheel-keyboard

[shenhavba]

I did not know that i should run it with command line parameters unril you said so.

Can i remove those parameters?

Thank you for checking this issue!

[amaitland]

Does this problem also occur in the CEF Sample Application from http://opensource.spotify.com/cefbuilds/index.html?

To compare with WPF run cefclient --multi-threaded-message-loop --off-screen-rendering-enabled
To compare with WinForms run cefclient --multi-threaded-message-loop
If you can reproduce the problem with cefclient then you'll need to report the bug on https://bitbucket.org/chromiumembedded/cef/overview there is no point opening an issue here. (Make sure you search before opening an issue)

@shenhavba The parameters to use were clearly outlined in the issue template.

Can i remove those parameters?

No. You can use the WinForms version until this has been resolved.

[AndrewBragdon]

This repros for me as well. Would be great if we could fix this, since it appears to affect all PDF files in the WPF version of cefsharp.

[perlun]

Seemingly fixed in CEF62 - those of you seeing this, please try the latest Nuget prerelease packages to see if you can also verify this is indeed fixed in our latest bits.

[amaitland]

Resolved in 62.0.0-pre01