dragging & dropping a folder into the sketch window throws exception

[processing-bot]

Created by: benfry

Normally, dragging and dropping a file onto the sketch window will add it to the data folder (if a data file) or add it as a tab (if it's source code, or at least editable by the current Mode).

Dropping a folder into the window throws a confusing exception; just need to detect this and show a better warning/error message. Could also recursively add to the data folder, but probably better to have users do that manually, since it's 1) extra code and 2) maybe not the expected behavior.

[processing-bot]

Created by: benfry

[processing-bot]

Created by: benfry

Added a better warning for beta 8.

[processing-bot]

Created by: github-actions[bot]

This issue has been automatically locked. To avoid confusion with reports that have already been resolved, closed issues are automatically locked 30 days after the last comment. Please open a new issue for related bugs.