[mmstick]

Closes pop-os/cosmic-settings-daemon#162

Takes ownership of the settings-daemon varlink client and passes it to a task that waits 128ms before applying and returning the client back to the application. This prevents the client from flooding the varlink server with messages as the slider is dragged. The volume to be applied is updated atomically during that 128ms delay so that the value of the slider at the time of applying is the value that will be sent to the settings daemon.

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[jklgrasso]

Regression testing passed

Checklist

Network & Wireless

Wi-Fi

• Able to disconnect from and connect to a network.

Bluetooth

• Bluetooth device connects.
• Paired device can be disconnected & reconnected.
• Paired device can be forgotten & connecting again works.

Desktop

Wallpaper

• Clicking a different wallpaper switches to it immediately
• Leaving the page and coming back does not change the wallpaper

Appearance

• Open a COSMIC app and a GNOME app. When switching between Dark and Light mode, the COSMIC app switches immediately, and the GNOME app switches after restarting.
• Changing the accent color works.
• Changing the roundness style works and does not affect other aspects of the theme (e.g. color mode).
• Changing the interface density works.

Panel

• Enable tiling. "Automatically hide panel" takes effect immediately.
• Disable tiling; maximize a window. "Automatically hide panel" takes effect immediately.
  • Not a regression

Dock

• Enable tiling. "Automatically hide dock" takes effect immediately.
• Disable tiling; maximize a window. "Automatically hide dock" takes effect immediately.
  • Not a regression
• Changing position on screen works.
• All Style settings take effect as expected.

Displays

• Plug in a second display. Displays can be rearranged via dragging.

Sound

TBD after devices/profiles are fixed.

Power & Battery

• Changing power mode takes effect and is reflected by top panel applet.

Input Devices

Touchpad

• All click behavior settings work as expected.
• All scrolling settings work as expected.

Applications

Default Applications

• Changing the default terminal affects Super-T shortcut.

X11 Applications Compatibility

• Global Shortcuts in X11 Applications work (in e.g. Discord).

Time & Language

Date & Time

• Changing time zone works.
• Toggling 24-hour time takes effect in Settings preview, on top panel, and on the lock screen.
• Toggling seconds takes effect in Settings preview and on top panel.
• Changing first day of week takes effect in Calendar applet.
• Turning date on/off for applet works.

System & Accounts

About

• Changing hostname works (check terminal prompt).