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Bug 1316

Summary: Resizing SDL window misbehavior on IceWM
Product: SDL Reporter: nfxjfg
Component: videoAssignee: Sam Lantinga <slouken>
Status: RESOLVED WONTFIX QA Contact: Sam Lantinga <slouken>
Severity: major    
Priority: P2    
Version: 1.2.14   
Hardware: All   
OS: Linux   
Attachments: Simple test program.

Description nfxjfg 2011-10-19 12:00:11 UTC 
Resizing a simple SDL window can trigger a strange misbehavior: after resizing the window with the mouse and having the program call SDL_SetVideoMode, SDL will send the program a bogus SDL_VIDEORESIZE event with the old size. This will throw the program into an infinite resize cycle, alternating the window size between the previous and new size in quick succession.

I suspect this is a bug that only happens on IceWM, as I couldn't reproduce it with another window manager (fluxbox). I observed this bug with IceWM 1.3.7.
Comment 1 nfxjfg 2011-10-19 12:01:22 UTC 
Created attachment 718 [details]
Simple test program.
Comment 2 nfxjfg 2011-10-19 12:02:11 UTC 
I also should mention that this doesn't happen if you don't pass the SDL_OPENGL flag.
Comment 3 Sam Lantinga 2011-12-29 01:51:31 UTC 
Do you have a patch to fix this issue?
Comment 4 nfxjfg 2011-12-29 02:17:20 UTC 
Unfortunately not.

All I can add is describing the workaround: that clearing out all SDL_VIDEORESIZE events from the event queue right after SDL_SetVideoMode made this behavior go away, but also lost some legit events.
Comment 5 Sam Lantinga 2011-12-29 02:51:10 UTC 
I'm really hesitant to change the X11 event processing at this point, since it's really delicate code and I don't want to introduce other bugs.

I'll close this for now, but if you come up with a good fix, please let me know!