Issue 1:
Wrap by Characters/Window.
Text for test:
https://image.ibb.co/hHh3H0/Em-Editor-Drag-In-Line-Number-Area.png
Drag in line number area and see the incorrect selections:
** Drag from 1 to 2.
** Drag in line 2 area.
** Drag from 2 to 3.
…
Issue 2:
New tab.
Ctrl+A. The selection is empty.
** Click the line number area. The selection is not empty.
Issue 3:
Several lines.
Drag in line number area till the mouse cursor is below the EOF line.
Use “Duplicate Line” command. (Or Ctrl+drag the selection and drop it at EOF.)
** Failed.
Note that in such a selection, the 1st line is the current line.
BTW,
“Duplicate Line” command should use “line(s)” in name and description.
cf. “Duplicate Column(s)” command.