Ctrl+Shift+D deleting the penultimate line also merges two lines

[Rangi42]

Version: Notepad3 (x64) 6.24.309.1 rc3

Open a new window, and type these lines:

aaa
bbb
ccc
ddd

Put the cursor anywhere on the ccc line and press Ctrl+Shift+D.

What I expect:

aaa
bbb
ddd

What I get:

aaa
bbbddd

This happens with both LF and CR+LF line ending settings.

[hpwamr]

What I get:

aaa
bbbddd

I confirm, it's a very old bug. 🤔

This bug started with version: Notepad3 6.23.502.1 beta

• [.502.1]- Multi-replace: correct advance next insertion point in case of SCI_REPLACETARGETMINIMAL.
• [.502.1]- Cut (Ctrl+X) and Delete (Ctrl+Shift+D) last line (EOF -> EOL).
• [.502.1]- Minor bugs in "Reset Notepad3's settings and themes" (SUP).

In addition:

• The bug only appears if the last line has no CRLF. 🤔

• If delete (Ctrl+Shift+D) is applied on the last line with a CRLF, it deletes 2 lines (lines 4 and 5). 🤔

• If line 3 is selected, it delete (Ctrl+Shift+D) 2 lines (lines 3 and 4). 🤔