It seems that the QuickLook preview disappeared after the Sequoia update. Is there any chance we could have it back? I did find it useful.
Cheers.
I never used this. In aTbRef I only found one article, but it did not plain how to use it. What is QuickLook? If it worked, how would I have used it?
Michael, QuickLook is a macOS utility that allows one to preview files, usually by selecting the file in Finder, PathFinder, DEVONthink, EagleFiler, etc., and pressing the space bar to bring up a preview. (That’s not the only method, but you get the gist.)
macOS has QuickLook capability for images, PDFs, and other files built in, and also allows developers to develop their own qlgenerator definitions telling macOS how to show a preview for a particular file time.
There was a qlgenerator for .tbx files that worked prior to Sequoia – and showed a preview of the last-viewed tab for that file, if I recall correctly. As Martin reported, this no longer works. Sequoia threw a spanner into a lot of useful things, so it’s not surprising this one got broken too.
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You might not have wanted or needed to use it at all. For me it was mainly useful to give me a visual reminder of a Tinderbox file I had imported or indexed in DEVONthink.
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The Tinderbox Tinderbox QL.qlgenerator is still embedded in the Tinderbox 10 package, FWIW.
Thanks, I see. 
The intent is to let you quickly preview a file without having to launch its corresponding app. I’ve found it to be extremely useful over the years.
This article by Howard Oakley suggests that the old .qlgenerator Quick Look files are no longer supported by Sequioa:
To check whether an app is still trying to use an old QuickLook Generator, look inside the app bundle in Contents/Library/QuickLook. If you see one or more .qlgenerator bundles there, then those no longer work in Sequoia. Instead, you should see new Thumbnail Extensions in Contents/PlugIns, where you should see App Extension bundles with names ending in something like Thumbnail.appex and QuickLook.appex. Some of the better apps provide both QuickLook Generators for compatibility with Mojave and earlier, and App Extensions for more recent macOS. To check whether an app is still trying to use an old QuickLook Generator, look inside the app bundle in Contents/Library/QuickLook. If you see one or more .qlgenerator bundles there, then those no longer work in Sequoia. Instead, you should see new Thumbnail Extensions in Contents/PlugIns, where you should see App Extension bundles with names ending in something like Thumbnail.appex and QuickLook.appex. Some of the better apps provide both QuickLook Generators for compatibility with Mojave and earlier, and App Extensions for more recent macOS. (How Sequoia has changed QuickLook and its thumbnails – The Eclectic Light Company)
Howard always goes in to far more technical detail than I understand, so please read the article to confirm for yourself, but it seems to me that Tinderbox is still using the older format Tinderbox QL.qlgenerator. According, to work with Sequoia, it will need a dedicated Tinderbox Quick Look plugin developed in the new format (.appex) under Contents/Plugin.
Again, I may have got this wrong… apologies if I have.
It will be back in time.
My impression is that this was a nice-to-have facility that was crucial to few people, if any. It was comparatively costly to support, and its replacement will be non-trivial.
Thank you!
It is nice to have, and is not essential for me at all. QL for Tinderbox only shows a small portion of the document, and the more complex a document becomes the less useful the QL display becomes.
My vote is to abandon QL. Very very few apps support QL.