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Bug 3453

Summary: First mouse button input after a drag and drop event is ignored
Product: SDL Reporter: Olav Sørensen <olav.sorensen>
Component: eventsAssignee: Sam Lantinga <slouken>
Status: RESOLVED FIXED QA Contact: Sam Lantinga <slouken>
Severity: major    
Priority: P2    
Version: HG 2.0   
Hardware: x86   
OS: Windows 10   

Description Olav Sørensen 2016-10-14 12:42:34 UTC 
(happens in Windows 10, and possibly in other OSes too)

After a drag and drop event, any following mouse button input (down/up) doesn't generate an event. Clicking any mouse button a *second* time generates an event like it should.

This bug is not present in 2.0.4, but it's present in the newest code base as of 14th of October 2016. This is a major bug and should be fixed before SDL 2.0.5 is released.
Comment 1 Olav Sørensen 2016-10-14 12:50:45 UTC 
I just found out that setting SDL_HINT_MOUSE_FOCUS_CLICKTHROUGH to 1 fixes the problem, so it's definitely related to the SDL_HINT_MOUSE_FOCUS_CLICKTHROUGH.
Comment 2 Olav Sørensen 2016-10-14 14:17:34 UTC 
Further investigation shows that the new SDL_HINT_MOUSE_FOCUS_CLICKTHROUGH logic also causes this issue in other cases, like the first time you open the program and click the mouse.
Comment 3 Sam Lantinga 2016-10-14 15:40:49 UTC 
Fixed, thanks for reporting this!
https://hg.libsdl.org/SDL/rev/bf0989bde198