Disable replaceAll quirk by default

Fixes #6208

doc/changelog.asciidoc

@@ -112,6 +112,12 @@ Changed
   valid, but was never customized.
 - The `statusbar.widgets` setting now understands `text:...` entries which
   allows adding a hard-coded text to the statusbar.
+- The polyfill for `String.replaceAll` (required for Nextcloud Calendar < 2.2.0
+  with QtWebEngine < 5.15.3) is now disabled by default, as it's not fully
+  compliant to the ECMAScript spec and might cause issues on other websites.
+  If you still need it (e.g. if you're still on an old Nextcloud Calendar
+  version), remove `js-string-replaceall` from
+  `content.site_specific_quirks.skip`.
 
 Fixed
 ~~~~~

doc/help/settings.asciidoc

@@ -2683,6 +2683,7 @@ Default: +pass:[true]+
 [[content.site_specific_quirks.skip]]
 === content.site_specific_quirks.skip
 Disable a list of named quirks.
+The js-string-replaceall quirk is needed for Nextcloud Calendar < 2.2.0 with QtWebEngine < 5.15.3. However, the workaround is not fully compliant to the ECMAScript spec and might cause issues on other websites, so it's disabled by default.
 
 Type: <<types,FlagList>>
 
@@ -2698,7 +2699,9 @@ Valid values:
  * +misc-krunker+
  * +misc-mathml-darkmode+
 
-Default: empty
+Default: 
+
+- +pass:[js-string-replaceall]+
 
 [[content.tls.certificate_errors]]
 === content.tls.certificate_errors

qutebrowser/config/configdata.yml

@@ -552,8 +552,14 @@ content.site_specific_quirks.skip:
       - misc-krunker
       - misc-mathml-darkmode
     none_ok: true
-  default: []
-  desc: 'Disable a list of named quirks.'
+  default: ["js-string-replaceall"]
+  desc: >-
+    Disable a list of named quirks.
+
+    The js-string-replaceall quirk is needed for Nextcloud Calendar < 2.2.0 with
+    QtWebEngine < 5.15.3. However, the workaround is not fully compliant to the
+    ECMAScript spec and might cause issues on other websites, so it's disabled by
+    default.
 
 # emacs: '