Add support for setting environment variables in Alt+F2. Such as LC_ALL=C Thunar
## Submitted by loc..@..il.com Assigned to **Nick Schermer** **[Link to original bug (#14614)](https://bugzilla.xfce.org/show_bug.cgi?id=14614)** ## Description Hello, everyone. Often I need to run a GUI application specifying some env variables, because some apps require them to work correctly. My particular example being: LC_ALL=zh_CN.utf8 wine /home/lockywolf/.wine/drive_c/Program\ Files/Tencent/WeChat/WeChat.exe However, xfce4-apprunner doesn't support such commands. If someone could help with it, would be great. Version: 4.13.0
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