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Bug 2338

Summary: Window minimizes itself when focus is lost to an app on another display
Product: SDL Reporter: Jeffrey Carpenter <i8degrees>
Component: videoAssignee: Sam Lantinga <slouken>
Status: RESOLVED FIXED QA Contact: Sam Lantinga <slouken>
Severity: normal    
Priority: P2 CC: philipp.wiesemann
Version: 2.0.1   
Hardware: x86_64   
OS: Other   

Description Jeffrey Carpenter 2014-01-07 23:31:41 UTC 
When using the flag SDL_WINDOW_FULLSCREEN_DESKTOP in a window -- either at creation or during a key input event -- if I click off on an application that is on another display monitor, my previously focused SDL window minimizes itself (without reporting any errors). I then have to find it on the dock and tell it to reshow itself. This happens consistently, 100% of the time.

This does not happen when using the SDL_WINDOW_FULLSCREEN flag.

Is this by design, or have I found a bug? For whatever it is worth, I have never encountered this kind of behavior on any other OS X application.

You can attempt to reproduce this bug as I have by editing src/test/SDL_test_common.c and modifying at line ~48 the variable state->window_flags. I used the testsprite2c.c example in my test case, although I am willing to bet that this will happen in any other example as well. (My game engine is where I first encountered this bug).

P.S. My testing system is a tri-monitor setup -- a Macbook Air and two external displays hooked up (the third one is via USB). My platform is Mac OS X 10.9 "Mavericks". I am curious if this behavior I describe happens on 10.8; before Apple made significant improvements in the handling of multi-displays.
Comment 1 Jeffrey Carpenter 2014-02-12 03:20:06 UTC 
Disabling the hint "SDL_HINT_VIDEO_MINIMIZE_ON_FOCUS_LOSS" fixes the behavior I deemed a bug in my report. I suppose this means that the "bug" is actually a "feature"...?

In any case, I'd love to see this hint mentioned in the official wiki documentation.

Thanks!
Comment 2 Philipp Wiesemann 2014-02-13 02:08:28 UTC 
(In reply to Jeffrey Carpenter from comment #1)
> Disabling the hint "SDL_HINT_VIDEO_MINIMIZE_ON_FOCUS_LOSS" fixes the
> behavior I deemed a bug in my report. I suppose this means that the "bug" is
> actually a "feature"...?
> 
> In any case, I'd love to see this hint mentioned in the official wiki
> documentation.
> 
> Thanks!

Hint added to wiki:

https://wiki.libsdl.org/SDL_HINT_VIDEO_MINIMIZE_ON_FOCUS_LOSS

Remarks are missing though.