[Differential] [Request, 20 lines] D2718: show an OSD on display button press

[sebas (Sebastian Kügler)]

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

REVISION SUMMARY
  Show the plasma OSD with icon "preferences-desktop-display-randr" and
  text when the display button has been pressed.
  
  When only one displays is connected, "No External Display" is connected.
  When more displays are connected, "Changing Screen Layout" is shown.
  
  This is pretty bare-bones, it doesn't show what kind of setup it will
  choose now, or next. This could be done by improving Generator, now,
  however. The problem is that when we're applying a new config, displays
  will flicker due to being mode-set, so the OSD isn't all that useful
  since the screens will settle down.
  It is useful in case of only one screen, since it gives feedback to a
  button that otherwise just appears do nothing.
  
  I think this could be enhanced in the future by giving the opportunity
  to pick a layout. For 5.8, this brings a noticeable improvement and lays
  the base for further work.

TEST PLAN
  manually tested both cases (1 and 2 screens)

REPOSITORY
  rKSCREEN KScreen

BRANCH
  sebas/displaybuttonosd

REVISION DETAIL
  https://phabricator.kde.org/D2718

AFFECTED FILES
  kded/daemon.cpp
  kded/daemon.h

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

To: sebas, #plasma
Cc: plasma-devel, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas
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