Multi line editing broken with right-to-left text

Description of the Issue

When switching to right-to-left text (CTRL + ALT + R), the block selection or multi line editing somehow still uses the left-to-right coordinates. As a result, if I select something and hit delete, Notepat++ actually deletes something different than what I selected.

The reason I (want to) use this mode is to multi-line-edit data that is right-aligned (as in the very simple example below).

Steps to Reproduce the Issue

1. Copy the following simple example into Notepad++:

abcDe
abcDe
abcDe
bcDe

2. Change to right-to-left mode using CTRL + ALT + R
3. Select the D in all lines using ALT + SHIFT + Left mouse
4. Hit DELETE.

Expected Behavior

Since I selected all the Ds I expected the Ds to disappear like this:

abce
abce
abce
bce

Actual Behavior

This is what I actually get:

acDe
acDe
acDe
bDe

Debug Information

Tested with both v7.9.5 and v8.1:

Notepad++ v7.9.5   (64-bit)
Build time : Mar 21 2021 - 02:13:17
Path : C:\Program Files\Notepad++\notepad++.exe
Admin mode : OFF
Local Conf mode : OFF
OS Name : Windows 10 Enterprise LTSC 2019 (64-bit) 
OS Version : 1809
OS Build : 17763.1999
Current ANSI codepage : 1252
Plugins : mimeTools.dll NppConverter.dll NppExport.dll 

Notepad++ v8.1   (64-bit)
Build time : Jun 17 2021 - 01:56:07
Path : C:\Program Files\Notepad++\notepad++.exe
Command Line : 
Admin mode : OFF
Local Conf mode : OFF
Cloud Config : OFF
OS Name : Windows 10 Enterprise LTSC 2019 (64-bit) 
OS Version : 1809
OS Build : 17763.1999
Current ANSI codepage : 1252
Plugins : mimeTools.dll NppConverter.dll NppExport.dll 

Start by reproducing the issue with the provided four-line example, RTL mode, block selection, and Delete action. Trace the multi-line selection and deletion handling for right-to-left text; done means deleting the selected D characters produces the expected four-line output without affecting adjacent characters.