[Differential] [Request, 4 lines] D2000: Make it possible to adjust volume even if it's muted

[xuetianweng (Xuetian Weng)]

xuetianweng created this revision.
xuetianweng added a reviewer: drosca.
xuetianweng added a subscriber: plasma-devel.
Restricted Application added a project: Plasma.

REVISION SUMMARY
  Do not disable the slider if it's muted. It would be more convinient if
  it's possible to change muted item volume, just like other mixers. Also
  unmute the device/stream if it's muted at the same time.
  
  Unfortunately, I didn't find a way to pretend to be visually disabled, 
  thus here we use opacity to get the similar visual feedback.

TEST PLAN
  test on my desktop

REPOSITORY
  rPLASMAPA Plasma Audio Volume Applet

BRANCH
  Plasma/5.7

REVISION DETAIL
  https://phabricator.kde.org/D2000

AFFECTED FILES
  applet/contents/ui/ListItemBase.qml

EMAIL PREFERENCES
  https://phabricator.kde.org/settings/panel/emailpreferences/

To: xuetianweng, drosca
Cc: plasma-devel, jensreuterberg, sebas
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