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Bug 3431

Summary: Duplicate SDL_KEYDOWN events for Left Alt and combinations
Product: SDL Reporter: Alex Smith <asmith>
Component: eventsAssignee: Ryan C. Gordon <icculus>
Status: ASSIGNED --- QA Contact: Sam Lantinga <slouken>
Severity: normal    
Priority: P2    
Version: HG 2.1   
Hardware: x86_64   
OS: Linux   

Description Alex Smith 2016-09-20 10:31:37 UTC 
If the Left Alt key is pressed, or a combination of that and another key is pressed, this will send two SDL_KEYDOWN events.

From what I can tell this is because for some reason X is sending two FocusOut events and a FocusIn event prior to the KeyPress event whenever Left Alt or a combination with it are pressed. On the FocusIn event X11_ReconcileKeyboardState is called, which will call SDL_SendKeyboardKey(SDL_PRESSED, ...) because it will see that the key is pressed. Then SDL_SendKeyboardKey will be called again on the KeyPress, which is treated as a repeat so another SDL_KEYDOWN is sent.

This is happening on Ubuntu 16.04 under Unity, with both SDL 2.0.4 and current HG.