Loop the append queue has been proved to be very inefficient, and
some times lead to N^2 time complexity.
Especially when some abnormal data could not be appended into the
real DOM, will make a dead loop.
Previously we use a 5000ms time out to handle this, which is not
user-friendly and not explicitly.
In this patch, we transform the queue into a tree data structure,
which reflects the layout of real DOM. With the tree data structure,
we can find whether there are dangling nodes that need to be dropped.
Also, the iteration will be much more efficient.
There is still a 500ms time out to avoid a dead loop, but should not
be called in expected scenarios.
* hack together stylesheet observer
* Add test coverage for insertRule/deleteRule on stylesheets
* Add new observers
* update patch based on changes to master
* Functioning event recording
* Remove print statements
* Fix ID usage and mark add vs remove
* Correct type
Co-authored-by: Jon Perl <perl.jonathan@gmail.com>
This is the record side impl of custom event, according to the
issue, we may also add first-class support for the custom event
tag like display color labels in the replayer-ui.
