Bug 256442 – [GTK][WPE] Tiles misplaced or missing on multiple map sites

• Status: RESOLVED
• Resolution: DUPLICATE
• Component: WebKitGTK

[Paul Bryan]

With Epiphany browser, sites that use tiles to render maps at different resolutions can miss or misplace tiles, especially when panning or zooming in and out.

Good examples at time of writing:
- OpenStreetMap (https://www.openstreetmap.org/)
- FireSmoke.ca (https://firesmoke.ca/forecasts/current/)

Versions:
- Epiphany 44.2 (flatpak)
- libwebkitgtk-6.0.so.4.0.2 (in org.gnome.Platform v44 flatpak)

[Kdwk]

I can reproduce

[Adrian Perez]

Reproducible with the WPE port as well.

[Paul Bryan]

Created attachment 466286 [details]
Epiphany rendering issue

Example of Epiphany rendering issue.

[Paul Bryan]

Maybe related, I've also seemed to have reproduced something similar, by scrolling on a site that's playing an embedded video. I've attached a screenshot.

Original page:
https://www.theonion.com/king-charles-iii-crowned-in-coronation-ceremony-1850415672

[Michael Catanzaro]

(In reply to Paul Bryan from comment #3)
> Example of Epiphany rendering issue.

This one is bug #253446.

[Michael Catanzaro]

Another map site where this bug occurs: https://brouter.m11n.de

[Michael Catanzaro]

Created attachment 466638 [details]
Screenshot of problem

I don't know how to reproduce it, but it happens somewhat regularly

[Michael Catanzaro]

Although this happens almost always in Tech Preview, I can't reproduce this at all with my personal build. :/

[Michael Catanzaro]

(In reply to Paul Bryan from comment #0)
> Versions:
> - Epiphany 44.2 (flatpak)
> - libwebkitgtk-6.0.so.4.0.2 (in org.gnome.Platform v44 flatpak)

Just want to add: this would have been with WebKitGTK 2.40.something, so this bug is an older issue, not a regression from the various recent graphics changes.

[Paul Bryan]

This now seems to have been resolved. I can no longer reproduce with:

- Epiphany 45.0-71-gb47be5405+
- WebKitGTK 2.43.3

[Michael Catanzaro]

Oh wow, you're right. It's fixed for me too. This must have been fixed very recently (maybe 2.43.3?); I remember being irritated by it a short while ago.

[Paul Bryan]

This appears to be resolved by:
https://github.com/WebKit/WebKit/pull/21432

[Paul Bryan]

This appears to be resolved by:
https://github.com/WebKit/WebKit/pull/21432

[Michael Catanzaro]

(In reply to Paul Bryan from comment #12)
> This appears to be resolved by:
> https://github.com/WebKit/WebKit/pull/21432

I'm impressed that you found the fix commit. Thanks.

*** This bug has been marked as a duplicate of bug 265990 ***

[Paul Bryan]

I can't take credit; @aperez:igalia.com (adrian) on Matrix pointed this out.