Bug 127168

Description:
When using the Autofilter pull-down menu to sort a column, the sort will fail if the spreadsheet contains vertically merged cells -- this is a separate issue documented in Bug 85807.  The problem I am reporting is that LibreOffice reports this failure by popping up a focus-stealing modal error dialog *underneath* the Autofilter pull-down menu.  This has two unfortunate consequences:

1) Depending on the placement of the pull-down menu, it can be impossible to read the error message.

2) At least on my windowing system (KDE Plasma), the modal dialog cannot be moved or resized, and steals focus not just within the LibreOffice Calc application but from all other windows.  So it is basically impossible to use the computer for anything until the error dialog is dismissed, but it is not obvious how to do this as the dialog's "OK" button is hiding behind the Autofilter pull-down.  You either need to blindly click on the unlabelled edges of the "OK" button or else press the Escape key.

Steps to Reproduce:
Also attached is a sample spreadsheet for triggering the bug.  Use the following steps to reproduce:

1. Open the attached spreadsheet.
2. Activate the Autofilter pull-down menu in cell A1.
3. Select "Sort Ascending" or "Sort Descending".

Actual Results:
4. The above-described focus-stealing modal error dialog pops up underneath the pull-down menu.  Attached is a screenshot showing what the problematic behaviour looks like.

Expected Results:
4. The modal error dialog should pop up *over* the pull-down menu, and it should not steal focus from other programs.


Reproducible: Always


User Profile Reset: No


OpenGL enabled: Yes

Additional Info:
Version: 6.3.0.4
Build ID: 30(Build:4)
CPU threads: 12; OS: Linux 5.2; UI render: default; VCL: gtk3; 
Locale: en-GB (en_CA.UTF-8); UI-Language: en-US
Calc: threaded

I am running LibreOffice from openSUSE Tumbleweed (x86_64) packages.  My windowing system is as follows:

KDE Plasma Version: 5.16.4
KDE Frameworks Version: 5.61.0
Qt Version: 5.13.0