Fix #8922: Crash when selling last member of shared order group while window was open #8923
+8
−3
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Motivation / Problem
#8922
Vehicle GUI window (while showing shared orders) could become empty while open (selling all vehicles in group)
Description
Close the window when shared order window's vehicle list becomes empty
Window was doing updates of internal state in OnPaint rather than OnInvalidateData which struck me as a bit weird, so moved stuff
Played around with it a bit (though not extensively), window still updates when it should, and doesn't crash
Limitations
Checklist for review
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