D24037: Add enforced mode size getter

[Roman Gilg]

romangg created this revision.
romangg added a reviewer: Plasma.
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REVISION SUMMARY
  Introduce little helper to API, which gives back either the current mode size
  or if no current mode is set the preferred mode or if there is no preferred
  mode as last resort the first one in the map if the map is not empty.

TEST PLAN
  Compiles.

REPOSITORY
  R110 KScreen Library

BRANCH
  enforcedModeSize

REVISION DETAIL
  https://phabricator.kde.org/D24037

AFFECTED FILES
  src/output.cpp
  src/output.h

To: romangg, #plasma
Cc: plasma-devel, LeGast00n, The-Feren-OS-Dev, jraleigh, fbampaloukas, GB_2, ragreen, ZrenBot, himcesjf, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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