Found numerous errors where icons weren't rendering correctly.
- Anything that's an action must have CSS using "codicon" not "icon"
since VSCode sets the "codicon" class automatically.
This affected Agent view in particular, but also:
- acounts view
- new tab view in dashboard
- many more
- Anything referencing the common-icons.css icons needed updating.
This hid help tooltip text in FormContainer UI for example.
- Finally I tried to convert all references from icon -> codicon,
even when the CSS was technically correct. This was done
for maintainability reasons - from now on always add codicon.
Fixes#7827
* edit perf
* Save multiline source in notebooks
* More merges
* Single, multi line works needs work
* Works with single + multi and recomputes active
* Actual perf improvements this time
* code cleanup
* Calculating output position on the fly
* Hmm can we use brackets to make this simpler?
* monday progress
* output working. lots of improvements.
* First tests working
* 10 tests now, fixed bugs
* Cleanup, add output test
* More fixes
* Need to still fix execution count bug
* Tests pass, added comments
* Cleanup
* PR comments round 1
* Deal with merge issues from master, layering
* Deleting duplicate file
* More PR Comments
* PR Comments
