OSR: Scrolling impossible when auto-scroll enabled by middle mouse button in PDF viewer

[Philip Kunz]

1. What steps will reproduce the problem?

   1. Run cefclient.exe --off-screen-rendering-enabled
   2. Open the sample.pdf using the local path to the file
   3. Press middle button in the application to enter "AutoScroll" mode.

2. What is the expected output? What do you see instead?

   1. It is expected to see an icon with arrows depending on the current operation. Auto-scroll of the document depending on the mouse position on the screen.
   2. Instead mouse icon does not change and scrolling is not possible anymore.

3. What version of the product are you using? On what operating system?

   1. Reproduced with cef_binary_98.1.21+g9782362 using windows 10.0.19042

4. Does the problem reproduce with the cefclient or cefsimple sample application at the same version? How about with a newer or older version?

   1. Reproduced with cef_binary_98.1.21+g9782362

5. Does the problem reproduce with Google Chrome at the same version? How about with a newer or older version?

   1. In Chrome or without OFR the behavior is as expected.

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[Alex Maitland]

The PDF viewer is being replaced in Chromium in M100, you can test with the new viewer by adding the command line argument listed at https://bitbucket.org/chromiumembedded/cef/issues/3047/add-support-for-new-non-ppapi-pdf-viewer#comment-61493941

I don’t expect the pan cursor to show.

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[Alex Maitland]

Quick check with M100 and it's still broken, further changes are required.