"Delete selected row(s)" fails if the underlying query contains an internal SQL function #838

Steps to reproduce this issue

1. Open HeidiSQL, load and execute an SQL query which contains an internal SQL function like in this case the date function "FROM_UNIXTIME":

SELECT channel_id AS Kanal,VALUE AS Wert,TIMESTAMP,FROM_UNIXTIME(TIMESTAMP / 1000 ) AS Echtzeit,id AS SQL_ID
FROM `volkszaehler`.`data` 
WHERE `channel_id` = 10
and TIMESTAMP> (unix_timestamp(current_timestamp)-24*60*60)*1000

2. Select a row.
3. Right click and choose "Delete selected row(s)"
4. The following pop-up will show up...

Current behavior

An error message shows up:

"Grid editing error: Column #3 has an undefined origin: Echtzeit"

Expected behavior

Ignore the column which - in this case - just reformats the timestamp into a human readable format.

Environment

HeidiSQL version: 10.3.0.5771 (32 bit, Windows 7)
Database system and version: MariaDB 10.3
Operating system: Linux 4.19.50-v7+ #896 SMP Thu Jun 20 16:11:44 BST 2019 armv7l GNU/Linux