Scrolling with mouse wheel does not work reliable when viewing PDF

[zheng-baocai]

• What version of the product are you using? 97.1.61.0

• What architecture x86 or x64? x64

• What version of .Net? .Net 4.5.2 or .Net 4.8

• On what operating system? Win10

• Are you using WinForms, WPF or OffScreen? WPF

• What steps will reproduce the problem? o Run CefSharp.Wpf.Example.exe, enter the URL http://www.pdf995.com/samples/pdf.pdf Resize the window if you do not see the scroll bar in the thumbnail view. o Scroll down to the last page with the mouse wheel and click that page In the thumnail view. Then the mouse wheel does no more scroll the page on the right side (content).

• What is the expected output? What do you see instead? Then the mouse wheel on the right side should keep working.

• Please provide any additional information below.

  • Does the cef log provide any relevant information? (By default there should be a debug.log file in your bin directory) console log: [0208/115949.023:INFO:CONSOLE(0)] "Unchecked runtime.lastError: Not implemented", source: chrome-extension://mhjfbmdgcfjbbpaeojofohoefgiehjai/index.html (0)

• Does this problem also occur in the CEF Sample Application Yes

[amaitland]

Thanks for taking the time to fill out the bug report.

• Does this problem also occur in the CEF Sample Application Yes

As per the bug report template, issues that reproduce with the CEF Sample Application need to be reported at the CEF Issue Tracker.

A quick check and it looks like this has already been reported at https://bitbucket.org/chromiumembedded/cef/issues/3153/mouse-wheel-in-chromium-pdf-viewer-doesnt

Closing as upstream as the bug needs to be fixed in CEF.

[amaitland]

This should be fixed by the new PDF Viewer which is due to be enabled by default in M100.

Starting in version 98 you can test it out using the following command line arg:

settings.CefCommandLineArgs.Add("enable-features", "PdfUnseasoned");