[BUG]: Starting in Big Picture mode does not start in fullscreen (macOS, not tested elsewhere)

[Noxillio]

Describe the Bug

I am a macOS user and have not tested this on any other operating system.

When selecting the options to start in Big Picture Mode and to start in fullscreen, PCSX2 will launch in Big Picture Mode, but within a normal-sized window instead of in fullscreen. This remains the case when the option to render in separate window is either enabled or disabled, and furthermore if you select a game it will not run in fullscreen contrary to its option being enabled.

Reproduction Steps

1. Launch PCSX2 and open the Interface settings.
2. Check box for "Start Big Picture UI".
   Optionally, also check box for "Start Fullscreen". It will make no difference but is a further issue.
3. Close and reopen PCSX2.
4. PCSX2 will open with the Big Picture UI, but not in fullscreen regardless of whether you enabled the other option.

Expected Behavior

Ideally, Big Picture UI should always open in fullscreen, but even if this is not intended, "Start Fullscreen" does not function when this issue occurs. If a player is utilizing Big Picture UI then it is because they do not wish to use their mouse. Furthermore, starting a game from the UI in this state will not put the game in fullscreen when "Start Fullscreen" is enabled. Not only is the latter not clearly intended, but needing to manually switch to fullscreen with their mouse/keyboard even though they are using Big Picture defeats the purpose.

PCSX2 Revision

v2.5.150

Operating System

macOS 15 (Sequoia)

If Linux - Specify Distro

No response

Logs & Dumps

No response

[TheTechnician27]

The part about "Big Picture" seems to be extraneous to this problem. At least on Linux KDE, Start Fullscreen does nothing regardless of the Big Picture option. While I disagree that Start Big Picture UI needs to automatically also Start Fullscreen, these two should be directly adjacent in the Qt UI due to how interrelated they are.

It's plausible the Start Fullscreen option only works on Windows. We'll see if anyone else wants to test. Either way, this is a major problem with the option.

[SternXD]

Yeah, does nothing on GNOME linux either. So I'm going to assume it only works on Windows if so I can try to look into this and see if I can possibly get a fix PRed tomorrow or something.

[Noxillio]

The part about "Big Picture" seems to be extraneous to this problem. At least on Linux KDE, Start Fullscreen does nothing regardless of the Big Picture option. While I disagree that Start Big Picture UI needs to automatically also Start Fullscreen, these two should be directly adjacent in the Qt UI due to how interrelated they are.

It's plausible the Start Fullscreen option only works on Windows. We'll see if anyone else wants to test. Either way, this is a major problem with the option.

This part does not seem to apply to macOS, as running in fullscreen in normal (Big Picture disabled) works as intended.

[bslenul]

Doesn't work on Windows 11 either, both settings work fine on their own but if they're both checked it will stay windowed when starting a game.

[JoelD333]

Having the same problem here on Arch.
Start on FullScreen does nothing when Start Big Picture UI is enabled.
Without Big Picture, it works fine.

I'am on nightly v2.5.238

[aldee]

I've found the issue, and have created the Pull Request here: #13489. Feel free to check.