Problem:
When running Notepad++ version 8.6.9, I cannot drag and drop text files to the GUI.
Solution:
If you downgrade to an older version, e.g. 8.6.7, drag and drop works normally.
Code:
$ snap list notepad-plus-plus --allName
Version Rev Tracking Publisher Notes
notepad-plus-plus 8.6.7 405 latest/stable mmtrt disabled
notepad-plus-plus 8.6.9 408 latest/stable mmtrt -
$ sudo snap revert notepad-plus-plus --revision 405
notepad-plus-plus reverted to 8.6.7
Another comment. Drag and drop works as long as you drag the file across the top toolbars. If you drag and drop the file anywhere else, such as where the lines and text are displayed, this will not work. Only drag and drop to the top toolbars.