Compatibility with `Dock Unroll` extension: window doesn't take full space after top panel is hidden.

[iitzrohan]

Describe the bug
I am using the dock unroll extension and when the panel hides itself, the window doesn't take full space.

To Reproduce
Steps to reproduce the behavior:

1. Install Dock unroll extension
2. Hover to top to bring top panel.
3. Move your mouse anywhere else from top panel.
4. The window doesn't take full height.

Expected behavior
The window should take full screen height but it gets stuck in the same position

Screenshots
If applicable, add screenshots to help explain your problem.

System information:
Please provide system information:

• if you installed PaperWM via extensions.gnome.org please open PaperWM settings and select the About tab (last tab) and click the Copy to Clipboard button and paste the information below, or;

• if you installed via source code, please execute ./gather-system-info.sh in you PaperWM clone and paste the information below

Distribution: Fedora Linux 40 (Workstation Edition)
GNOME Shell: 46.3.1
Display server: Wayland
PaperWM version: 46.15.0
Enabled extensions:
- AlphabeticalAppGrid@stuarthayhurst
- appindicatorsupport@rgcjonas.gmail.com
- clipboard-history@alexsaveau.dev
- cloudflare-warp-toggle@khaled.is-a.dev
- Battery-Health-Charging@maniacx.github.com
- window-thumbnails@G-dH.github.com
- paperwm@paperwm.github.com
- Vitals@CoreCoding.com
- dock-unroll@fthx

Additional context
I have also submitted this bug report to dock unroll extension
https://github.com/fthx/dock-unroll/issues/1

[Lythenas]

I think we had similar issues with similar extensions that hide or move the topbar in the past. E.g. Fullscreen Avoider #707

Does this fix itself if you e.g. resize the window?

Does changeing the "Enable Window Position Bar" setting change anything about the situation?

Taking a quick look at the code, it uses this to hide the panel:

const HIDDEN_PANEL_HEIGHT = 0.01; // px (> 0 !)
//...
_hidePanel() {
        Main.panel.ease({
            duration: ANIMATION_TIME,
            height: HIDDEN_PANEL_HEIGHT,
            onComplete: () => {
                Main.panel.opacity = 0;
                Main.layoutManager._updateHotCorners();
            },
        });
    }

It might be possible to add compatibility for this.

[iitzrohan]

Yes, the window does fix itself after resizing.

[jtaala]

const HIDDEN_PANEL_HEIGHT = 0.01; // px (> 0 !)

Ah, they're using panel.height instead of something like hide().

Generally we wouldn't address specific extension implementations/overrides given that's a different approach to how Gnome works. But it is a valid approach (and tbh, PaperWM used to use a similar approach for Gnome topbar hiding).

Anyways, a notify signal could be added on the height property of panel that could trigger a layout on that space (which would re-adjust window sizes).