I'm trying to rewrite an old AppleScript mail rule that I used extensively as a Mail extension using the MailKit framework and I've run into an issue. Previously, when developing the script, it was possible to debug it by selecting the message I wanted it applied to and choosing the Mail.app menu item "Message/Apply Rules" This would re-execute my script and I could iterate over it as many times as I liked while developing. I haven't found any great way of doing this for my extension with a MEMessageActionHandler. The closest I've found is to forward the message to myself and wait for it to come back in again over the internet, at which point the extension would get executed again. Needless to say, this makes debugging my MEMessageAction handler much slower. I've tried a number of things in Mail.app to try and get it to re-execute my extension with a particular message without any luck. Does anyone know of a good process for debugging a MEMessageActionHandler that doesn't involve forwarding the message to myself over and over and waiting for it to come in each time?

This issue has already been reported to Apple via the Feedback Assistant as FB12401598 and a code-level support incident has been opened to follow up, but so far I haven't heard anything. The problem is that the NSAttributedString used to be able to load HTML files correctly via the [NSAttributedString initWithHTML:options:documentAttributes:] method (or its Swift equivalent). As of the developer beta of Sonoma, however, this no longer works. The method loads the attributedString but HTML tables are completely ignored. Every cell in the table just appears on a new line. The app I'm working on has a bunch of HTML templates that get drawn inside another View using an NSAttributedString. This has worked for years but no longer works on Sonoma. Does anyone know a decent workaround for correctly drawing some formatted text whose formatting is specified via HTML? I'm currently exploring the idea of converting the HTML files to RTF on an older system and using RTF, but the RTF format isn't nearly as simple as HTML. Here's a screenshot of a simple project and Safari showing the same HTML side by side