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WPF/OffScreen - CEF rendering issue on window resizing #2939

Description

@janghaksang

Bug Report

Delete this line and everything above, and then fill in the details below.

  • What version of the product are you using?
    • What version are you using? Nuget? CI Nuget? build from a branch? If so which branch? Please include the exact version number you are using (no ambiguous statements like Latest from Nuget)
      e.g. 57.0.0 or 63.0.0-pre01
    • Please only create an issue if you can reproduce the problem with the latest version. (If you are using the latest stable release please check to see if there is a newer -pre release and test with that also).

master branch (2019/10/21 18:48:22) 441e8bc [441e8bc]

  • What architecture x86 or x64?
    x64
    vs2017 15.9.16
    NET Framework 4.5.2
    winsdk 10.0.18362.0 (installed, but not applied in project)

  • On what operating system?

    • Win7, Win 8, Win10, etc?
      Win10
  • Are you using WinForms, WPF or OffScreen?
    WPF (default wpf example)

  • What steps will reproduce the problem?

    • 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).
  1. execute
  2. window resize (size down)
  • What is the expected output? What do you see instead?
    image

  • Please provide any additional information below.

    • A stack trace if available, any Exception information.

    • Does the cef log provide any relevant information? (By default there should be a debug.log file in your bin directory)

    • Any other background information that's relevant? Are you doing something out of the ordinary? 3rd party controls?

  • 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 --enable-gpu
    • 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)
    • Please include the version you tested with e.g. cef_binary_3.3029.1611.g44e39a8_windows64_client.tar.bz2. It's important to you test with the same version that CefSharp is based on. Check the release notes to determine the version (https://github.com/cefsharp/CefSharp/releases) or load chrome://version in the browser.

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    offscreenupstreamThese issues require fixing in the Chromium Embedded Framework(CEF) or Chromium.wontfixwpfWPF Implementation

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