Security update for webkit2gtk3

Open Source Vulnerabilities SUSE-SU-2020:1135-1

This update for webkit2gtk3 to version 2.28.1 fixes the following issues: Security issues fixed: - CVE-2020-10018: Fixed a denial of service because the m_deferredFocusedNodeChange data structure was mishandled (bsc#1165528). - CVE-2020-11793: Fixed a potential arbitrary code execution caused by a use-after-free vulnerability (bsc#1169658). - CVE-2019-8835: Fixed multiple memory corruption issues (bsc#1161719). - CVE-2019-8844: Fixed multiple memory corruption issues (bsc#1161719). - CVE-2019-8846: Fixed a use-after-free issue (bsc#1161719). - CVE-2020-3862: Fixed a memory handling issue (bsc#1163809). - CVE-2020-3867: Fixed an XSS issue (bsc#1163809). - CVE-2020-3868: Fixed multiple memory corruption issues that could have lead to arbitrary code execution (bsc#1163809). - CVE-2020-3864,CVE-2020-3865: Fixed logic issues in the DOM object context handling (bsc#1163809). Non-security issues fixed: - Add API to enable Process Swap on (Cross-site) Navigation. - Add user messages API for the communication with the web extension. - Add support for same-site cookies. - Service workers are enabled by default. - Add support for Pointer Lock API. - Add flatpak sandbox support. - Make ondemand hardware acceleration policy never leave accelerated compositing mode. - Always use a light theme for rendering form controls. - Add about:gpu to show information about the graphics stack. - Fixed issues while trying to play a video on NextCloud. - Fixed vertical alignment of text containing arabic diacritics. - Fixed build with icu 65.1. - Fixed page loading errors with websites using HSTS. - Fixed web process crash when displaying a KaTeX formula. - Fixed several crashes and rendering issues. - Switched to a single web process for Evolution and geary (bsc#1159329).