Crash when attempting to load a game after toggeling opengl rendering

[Hans Joachim Desserud]

Steps to reproduce:
1. Start a new game.
2. Go to Single Player -> Load game.
3. Go back to main menu.
4. Go to Options -> Advanced settings.
5. Toggle opengl rendering, ie turn it off if it is on and vise versa.
6. Click Ok/Use to apply the changes and go back to main menu.
7. Go to Single Player -> Load game.

Expected result:
The load game screen listing saved games.

Actual result:
The game crashes, see attached backtrace.

I haven't investigated much, but it only seems to trigger if I have loaded the save game screen prior to changing rendering, otherwise it works fine. (Might be some previous values lingering?) It does seem to trigger regardless of whether opengl has been turned on or off so it might be the switch itself it fails to handle, as it works fine in either mode alone.
Other screens might be affected too, though I haven't had time to investigate properly.

Widelands r6820.

[SirVer (sirver)]

Setting to incomplete for bug sweeping.

[Launchpad Janitor (janitor)]

[Expired for widelands because there has been no activity for 60 days.]

[Hans Joachim Desserud (hjd)]

No longer able to trigger this when enabling opengl, have not been able to test disabling due to bug 1389346. Might have been fixed by the switch to SDL2 and/or recent refactoring in this screen.

[GunChleoc (gunchleoc)]

Fixed in build19-rc1.