I have done now many tests with editing my datafields with SDK 8.2.1.
Here are my findings:
1) "small" datafields with about some hundrets of code lines:
Everything works as promised.
-Real-Time Errors and Warnings: work immediately
-Autocompletion: ok
2) "large" datafields with about some thousends of code lines - which are at the edge of "stack overflow" or "out of memory" for elder (no Graphics Pool) devices:
Nothing works as promised.
-Real-Time Errors and Warnings: appear immediately but do not clear for minutes!
See an attached screenshot (sorry - forum does not allow the screenshot...): There is a line marked as error - which is no error since typing was completed, but stays as error even after the project has built sucessfully. The red error line disappears after some minutes!
-Autocompletion: does not work. You have to wait a long time for appearing. That's of no help while typing.