06670: 'Alt-Tab' doesn't work with fullscreen opengl/bgfx/gdi video

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
06670	Interface	Minor	Always	Aug 28, 2017, 07:52	Aug 28, 2017, 16:55

Tester	Maarten	View Status	Public	Platform	MAME (Official Binary)
Assigned To		Resolution	Open	OS	Windows 10 (64-bit)
Status [?]	Confirmed			Driver
Version	0.187	Fixed in Version		Build	64-bit
		Fixed in Git Commit		Github Pull Request #

Summary	06670: 'Alt-Tab' doesn't work with fullscreen opengl/bgfx/gdi video
Description	When running MAME on MS-Windows full-screen in combination with either opengl, bgfx, or gdi video, 'alt-tab' does not switch to other applications. Instead, the focus remains on the MAME window.
Steps To Reproduce	1.) On Windows, open a random application (notepad, for example) in order to have something to alt-tab switch to. 2.) Start mame fullscreen with either opengl, bgfx, or gdi as the video mode. mame64.exe pacman -nowindow -video opengl 3.) Press 'ALT-TAB' to switch to the other application. Expected results: The focus changes to another application. Actual results: Focus remains on MAME.
Additional Information	Switching between windows with alt-tab when running '-video d3d' does work as expected (does switch between windows). So it appears to be restricted to opengl, bgfx, and gdi. Also, when running MAME windowed instead of fullscreen (even with opengl/bgfx/gdi) alt-tab works as expected, so it is restricted to full-screen.
Github Commit

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No.14144 Fujix Administrator Aug 28, 2017, 08:22	Not a Graphic issue. changed the category.