fix a failing test

Dependencies

• [2] PX7DDEMO autosave slightly less aggressively
• [3] PLKNHYZ4 extract a function
• [4] XNFTJHC4 split keyboard handling between Text and Drawing
• [5] 2RXZ3PGO beginning of a new approach to scroll+wrap
• [6] H2DPLWMV snapshot: wrapping long lines at word boundaries
• [*] BULPIBEG beginnings of a module for the text editor
• [*] AYE2VEGJ extract a couple of methods

Change contents

• edit in text.lua at line 204
  [4.2556]→[3.44:90](∅→∅)
  − Text.clear_cache(Lines[Cursor1.line])
• edit in text.lua at line 214
  [4.2679]→[3.91:139](∅→∅)
  − Text.clear_cache(Lines[Cursor1.line-1])
• edit in text.lua at line 224
  [4.3000]

  [9.173]
  + Text.clear_cache(Lines[Cursor1.line])
• edit in text.lua at line 249
  [4.3565]→[3.140:186](∅→∅)
  − Text.clear_cache(Lines[Cursor1.line])
• edit in text.lua at line 257
  [4.3558]→[3.187:233](∅→∅)
  − Text.clear_cache(Lines[Cursor1.line])
• edit in text.lua at line 260
  [4.3922]

  [2.112]
  + Text.clear_cache(Lines[Cursor1.line])