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Bug 4428

Summary: ime_threadmgrex turns invalid if window loses focus while using COINIT_MULTITHREADED
Product: SDL Reporter: t.eddenburg
Component: *don't know*Assignee: Ryan C. Gordon <icculus>
Status: NEW --- QA Contact: Sam Lantinga <slouken>
Severity: normal    
Priority: P2 CC: xenotron007
Version: 2.0.9   
Hardware: x86_64   
OS: Windows 10   

Description t.eddenburg 2018-12-16 10:01:34 UTC 
Before initializing SDL2 I call CoInitializeEx(0, COINIT_MULTITHREADED).
Then using the events subsystem, it works fine until my window loses fokus.
Then it does lose fokus in SDL_windowskeyboard.c in UILess_DisableUIUpdates will be a read access violation since ime_threadmgrex->lpVtbl turns invalid (the pointer lpVtbl itself didn't change).
This does not happen without CoInitializeEx(0, COINIT_MULTITHREADED), but SDl2 is supposed to be compatible with COINIT_MULTITHREADED?
Comment 1 xenotron007 2019-02-07 22:09:21 UTC 
The crashing code belongs to the uiless windows IME that seems to be incomplete and doesn't work. You can try to disable it by recompiling the library with either SDL_DISABLE_WINDOWS_IME defined or the following line commented out:

videodata->ime_uiless = UILess_SetupSinks(videodata);