#2195 QT Launcher "forgets" default aircraft folders

[Bjoern K]

Problem:
After recompiling SG and FG from Git, the QT launcher's "Aircraft" tab does not show the installed default aircraft (C172p , Video Assistant, UFO). All three are present in $FGDATA/Aircraft.

OS: Arch Linux
Latest FG commit: a3d75e8573f789e92f319dd294619ed49ba7dd8b (Mar 16, 2020)
Latest SG commit: c8d802bc1d7d26e5d017c41c7612db34e9c0a5cb (Mar 15, 2020)

Reproduction:
Compile FG and SG from the "Next" branch
"fgfs --launch"

Workaround:
Add $FGDATA/Aircraft as an additional aircraft folder in the "Add-ons" tab
Restart the launcher --> duplicate entries for the C172 and UFO in the "aircraft" tab
Remove the folder from "additional folders" again
Restart the launcher
--> The default aircraft display in the "Aircraft" tab just fine; FG loads them properly

[James Turner]

Fixed in FlightGear commit 5dc2f20848c92a424e8d48594e9b36111d248c87

[Daniel Dubreuil]

Same report for this same issue by a french forum user.
(22 march 2020 compilation).
Version: FlightGear 2019.2.0
OS: Linux Mint 19.3
http://fr.flightgear.org/forums/viewtopic.php?id=4710
Same workaround, which works.

[Daniel Meissner]

Default aircraft are back for me on next. It worked, can confirm.

[Bjoern K]

I've just rebuilt SG and FG and I do not see this issue reoccur. Thanks for the fix!