bugfix: syntax highlighting in source editor

Dependencies

• [2] GZ5WULJV switch source side to new screen-line-based render
• [3] KKMFQDR4 editing source code from within the app
• [4] UN7GKYV5 support hyperlinks in the source editor
• [5] KMSL74GA support selections in the source editor
• [6] H4R5BHVY no more Text allocations

Change contents

• replacement in source_text.lua at line 47
  [3.88189]→[2.1328:1390](∅→∅)
  − select_color(f)

  − App.screen.print(f, State.left,y)
  [3.88189]

  [3.88227]
  + -- render colorized text

  + local x = State.left

  + for frag in f:gmatch('%S*%s*') do

  + select_color(frag)

  + App.screen.print(frag, x,y)

  + x = x+App.width(frag)

  + end