"Column #x has an undefined origin" when trying to delete row from a multi-table result #839

Please note: This issue is closely related to #838

Steps to reproduce this issue

1. Open HeidiSQL, load and execute an SQL query which contains an a subquery to another table:

SELECT channel_id AS Kanal,
  (SELECT VALUE FROM `volkszaehler`.`properties`  WHERE  `entity_id` = 10 AND `pkey` = 'title') AS Name,
  VALUE AS Wert,
  TIMESTAMP, id AS SQL_ID
  FROM volkszaehler`.`data`
  WHERE `channel_id` =  10

2. Select a row.

3. Right click and choose "Delete selected row(s)"
   A pop-up will show up...

Current behavior

"Grid editing error: Column #1 has an undefined origin: Name"

Expected behavior

Delete the row without affecting the column coming from the sub-query.

Possible solution

Show a pop-up informing the user about the unknown origin of that column. Explain that the delete operation won't affect the values in that column. Ask if he/she is sure about that delete and wants to continue.

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