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Bug 4939

Summary: Keys can get stuck in pressed state
Product: SDL Reporter: Rokas Kupstys <rokupstys>
Component: videoAssignee: Sam Lantinga <slouken>
Status: NEW --- QA Contact: Sam Lantinga <slouken>
Severity: normal    
Priority: P2 Keywords: target-2.0.16
Version: 2.0.10   
Hardware: All   
OS: Windows (All)   

Description Rokas Kupstys 2020-01-13 14:00:12 UTC 
Steps:
1. Open SDL application and have it's window focused.
2. Press LGUI+v

Result:
Builtin windows clipboard utility pops up and SDLK_LGUI is not reported as released even though GetKeyState(VK_LWIN) does report key as released.

Expected result:
SDL should report SDLK_LGUI as released.

Cause:
Win32 does not send WM_KEYUP message.

Originally reported at: https://github.com/ocornut/imgui/issues/2976
Comment 1 Rokas Kupstys 2020-01-13 14:47:47 UTC 
Actually this is true for every key. If key is released while window does not have focus VM_KEYUP will not be sent to that window.
Comment 2 Rokas Kupstys 2020-01-17 11:00:27 UTC 
For reference, this is how GLFW fixed it: https://github.com/glfw/glfw/commit/562c17d131bd99d92f1166e2a8a42d7af023d122