Hugin crashes when clicking twice on "optimize" while Hugin is busy

[Florian Königstein]

To reproduce it, start Hugin, and open a PTO file that is large enough so that the loading takes some seconds. Probably you could instead start some other action so that Hugin is busy for some seconds.
Before the loading has finished (or Hugin has finished the other action), press (left-click on) the grayed out button for geometrical optimization in the "images" tab TWO times.
After loading has finished, two windows with title "Panorama Tools" will appear. In one the text 012345678901234567890123456789... appears
and nothing changes over time.
The other "Panorama Tools" window behaves normally. When finished optimization, accept the results.
Then Hugin will crash.

Betriebssystem: Windows 10 (build 19042), 64-bit edition
Architektur: 64 bit
Freier Speicher: 59397196 kiB
Aktive Codepage: 1252 (Western European Windows)

Hugin
Version: Pre-Release 2021.0.0.f77f3586f101 built by Thomas
Ressourcen-Pfad: C:\Program Files\Hugin\share\hugin\xrc\
Datenpfad: C:\Program Files\Hugin\share\hugin\data\
Hugins Kamera- und Objektivdatenbank: C:\Users\user\AppData\Roaming\hugin\camlens.db
Multi-Threading mittels C++11 std::thread und OpenMP
Monitorprofile: C:\Windows\system32\spool\drivers\color\sRGB Color Space Profile.icm

Bibliotheken
wxWidgets: wxWidgets 3.1.6
wxWidgets Library (wxMSW port)
Version 3.1.6 (Unicode: wchar_t, debug level: 1),
compiled at Oct 16 2021 14:59:21

Runtime version of toolkit used is 10.0.

libpano13: 2.9.21
Exiv2: 0.27.4
SQLite3: 3.35.5
Vigra: 1.11.1
LittleCMS2: 2.10

[tmodes (tmodes)]

Fixed in repository