Summary: Save button disabled when dragging a folder from finder into the Save dialogue for file that has not been previously saved (new files or converted documents.)

1. InDesign Version 13.0.1 - macOS
2. To reproduce error: Create a new file (this is required), choose Save As, drag a folder from the finder into the Save As dialogue, press "Save"
3. Expected result: Save action to take place
4. Actual result: Save button has no effect (browsing to a new folder will re-enable the Save button)