Sync with host's clock-format GSettings

[ryonakano]

What Happened

I use Granite.Widgets.TimePicker in my flatpaked app and noticed it does not follow the clock-format setting (12h or 24h) chosen in the host system.

Looks like TimePicker checks the clock-format using Granite.DateTime.is_clock_format_12h () which uses GSettings key org.gnome.desktop.interface.clock-format. However, since GSettings in flatpak apps is sandboxed this returns the value from the sandbox―not from the host.

Expected Behavior

Granite.DateTime.is_clock_format_12h () should always return the host clock-format setting.

Steps to Reproduce

1. Choose 12h as a clock-format in Date & Time Plug
2. Open Terminal
3. Run gsettings get org.gnome.desktop.interface clock-format. You should get '12h'
4. Run some app in Flatpak, e.g. flatpak run --command=sh io.elementary.screenshot
5. Run gsettings get org.gnome.desktop.interface clock-format in the sandboxed prompt. You should get '24h' regardless of the host's clock-format setting

Logs

N/A

Platform Information

• elementary OS 6 Odin with fully updated
• libgranite-dev: 6.1.0+r2071+pkg119~ubuntu6.1
• flatpak: 1.10.2~ubuntu6.1

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[jhaygood86]

I fixed this in #527 by using the portal

[ryonakano]

Should be fixed by #529. Thank you for your work!