copying to clipboard can never scroll

Dependencies

• [2] IFTYOERM line.y -> line_cache.starty in a few more places
• [3] LF7BWEG4 group all editor globals
• [4] S2MISTTM add state arg to a few functions
• [5] 2L5MEZV3 experiment: new edit namespace
• [6] PTDO2SOT add state arg to schedule_save
• [7] LNUHQOGH start passing in Editor_state explicitly

Change contents

• edit in edit.lua at line 385
  [3.13241]→[2.943:1050](∅→∅)
  − for _,line_cache in ipairs(State.line_cache) do line_cache.starty = nil end -- just in case we scroll