08603: Screen Position/Stretch options won't extend beyond system's original screen size

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
08603	Interface	Minor	Always	Apr 14, 2023, 17:12	May 1, 2023, 19:48

Tester	ICEknight	View Status	Public	Platform	MAME (Official Binary)
Assigned To		Resolution	No change required	OS	Windows 10/11 (64-bit)
Status [?]	Closed			Driver
Version	0.253	Fixed in Version		Build	64-bit
		Fixed in Git Commit		Github Pull Request #

Summary	08603: Screen Position/Stretch options won't extend beyond system's original screen size
Description	Using the Screen Position and Screen Stretch sliders to move or expand the picture will hide anything that's beyond the initial screen dimensions.
Steps To Reproduce	- Load any 4:3 system while using a 16:9 monitor (hharry) or, alternatively, a vertical game in a horizontal monitor (pacman). - Open the sliders menu with the tilde key. - Move the screen horizontally with the "Screen Horiz Position" (or vertically, in vertical monitor games) or stretch it with "Screen Horiz Stretch" and you'll see that part of the screen will be hidden, even though there's still some free space being used by the slider itself.
Additional Information	I know this makes sense when windowed, but maybe it should use the full screen space when MAME is running full screen?
Github Commit

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Affected Sets / Systems

Attached Files	hharry1.png (259,891 bytes) Apr 14, 2023, 17:14 Uploaded by ICEknight
	hharry2.png (207,744 bytes) Apr 14, 2023, 17:14 Uploaded by ICEknight
	wol1.png (149,817 bytes) Apr 14, 2023, 17:14 Uploaded by ICEknight
	wol2.png (187,939 bytes) Apr 14, 2023, 17:15 Uploaded by ICEknight

No.21316 Robbbert Senior Tester Apr 15, 2023, 11:23	I can confirm your observations. It makes sense that you could push the picture over to the left or right side and expect it to remain whole, however I'm sure there's some technical reason why it can't happen.
No.21380 cuavas Administrator May 1, 2023, 19:48	That’s what it’s supposed to do. It’s like adjusting the size controls on a CRT TV – you can’t see any part of the image that you push into the overscan area.