D24772: Immediate refresh weather data on startup

[Wolfgang Reissenberger]

wreissenberger created this revision.
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REVISION SUMMARY
  Depending on the refresh period of an INDI weather driver it could take a while until the first data point is received. Until this happens, the list of sensors remains empty.
  To avoid this, an immediate refresh is called when the display is initialized.
  
  Additionally, some UI optimizations have been added:
  
  - Splitter between dome and weather display added
  - When only one data point is available in the history, a dot is displayed

TEST PLAN
  Use the openweathermap INDI driver and observe, that with this fix the sensor data is immediately present

REPOSITORY
  R321 KStars

BRANCH
  observatory_sensor_refresh

REVISION DETAIL
  https://phabricator.kde.org/D24772

AFFECTED FILES
  kstars/ekos/auxiliary/weather.cpp
  kstars/ekos/auxiliary/weather.h
  kstars/ekos/observatory/observatory.cpp
  kstars/ekos/observatory/observatory.ui
  kstars/ekos/observatory/observatoryweathermodel.cpp
  kstars/ekos/observatory/observatoryweathermodel.h
  kstars/indi/indiweather.cpp
  kstars/indi/indiweather.h

To: wreissenberger
Cc: kde-edu, narvaez, apol
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