Tab-completed @Mentions should only be sent as display names in the `body` of the event. The HTML should be unaffected, and always sent as an anchor tag.
This stops react-sdk from tracking any state previously stored for the purposes of enabling or disabling the lab feature that enabled the new MessageComposer. It is now enabled permanently.
This is being done with the hope that we can get more feedback for it so that when we release we can be confident that people will be OK with the changes it brings.
When sending the letter "a" we expect it to be sent as a text message when RTE is enabled because we now detect that there is no formatting or styled blocks in the composer. We also expect emoji to be sent as plaintext if there is no formatting
Don't include src in resolve root for the karma test, as otherwise
modules from react sdk get pulled in instead of npm libraries like
'extend' which breaks everything in really subtle ways.