wx.html2.WebView with WebKit 2 does not display pictures from the disk

[Jenyay]

Operating system: Ubuntu 18.04
wxPython version & source: wxPython 4.0.1, 4.0.3
Python version & source: Python 3.6

If you install wxPython using WebKit 2, then images with relative paths or with the file: // protocol will not be displayed. Everything works fine with WebKit 1.

I think this error is related to #981.

[swt2c]

Can you provide a specific example of html that doesn't work for you? I am not seeing any problems with relative or file URLs.

[Jenyay]

@swt2c I made a minimal example where the problem is being observed. - testwebkit.zip

[swt2c]

Thanks for the example. Unfortunately, I still don't see the problem when using your example. I tried on Fedora 29 and Ubuntu 18.04 - in both cases I tried the distribution packages for wxPython (version 4.0.1).

[Jenyay]

Probably these packages are compiled using WebKit 1. I also don’t see problems if I install wxPython 4.0.3 in Ubuntu 18.04. The problem is observed if I install wxPython 4.0.3 in Ubuntu 16.04 or compile from source using WebKit 2.

[Jenyay]

I updated the example to it show engine version - testwebkit_2.zip

In Ubuntu 18.04 + wxPython 4.0.3 from the wheels everything is working:

In Ubuntu 18.04 + wxPython 4.0.3 from the compiled sources no images are displayed:

Similarly in Ubuntu 16.04 + wxPython 4.0.3 from the wheels.

[swt2c]

Probably these packages are compiled using WebKit 1. I also don’t see problems if I install wxPython 4.0.3 in Ubuntu 18.04. The problem is observed if I install wxPython 4.0.3 in Ubuntu 16.04 or compile from source using WebKit 2.

Nope, Fedora 29 doesn't even have WebKit 1 packages, and the Ubuntu 18.04 wxwidgets package was build with WebKit2, see build log here:
https://launchpadlibrarian.net/362519168/buildlog_ubuntu-bionic-amd64.wxwidgets3.0_3.0.4+dfsg-3_BUILDING.txt.gz

[Jenyay]

Do I understand correctly that if Ubuntu has libwebkitgtk-3.0, then the compilation will be with WebKit 1, and if there is libwebkit2gtk-4.0, then WebKit 2?

[Jenyay]

Is there a way to explicitly specify the required version of WebKit?

[swt2c]

The wxWidgets build process will search for WebKit2 first, and if not found, it will search for WebKit1. Unfortunately, no there isn't a way to specify WebKit1 only, other than removing the WebKit2 development package so it will not be found.

[Jenyay]

I compiled (Ubuntu 18.04) and uploaded wheel with which there is a problem. https://drive.google.com/drive/folders/12LqBgdQPWw0BcetRLJ0iVicpa0rKzTul?usp=sharing

Try the example above with this version.

[Jenyay]

Can you reproduce the problem?

[swt2c]

No, but I did not try your wheel.

[Jenyay]

I understand when an error occurs. The error appears if there are non-Latin characters on the path to the file being opened. For example if the previous script is located at /home/jenyay/temp/webkit/test/ then everything works fine. The error occurs when the script is placed at /home/jenyay/temp/webkit/проверка/

[swt2c]

Aha! That would explain why I could not reproduce it. I can reproduce now in wxWidgets. I'll look into the issue.

[Jenyay]

I noticed that in the same case external JavaScript files are not loaded, perhaps, still CSS files, but I did not tested.

[swt2c]

As far as I can tell, this is a bug in WebKit2 itself. It is refusing to load those images. I am reporting it upstream.

[Jenyay]

A bug is similar to a known issue - https://bugs.webkit.org/show_bug.cgi?id=184660. Unfortunately, they are not going to solve it.