assert for a bug I saw a while ago but can no longer reproduce

Dependencies

• [2] UWNHC4AA redo y computations
• [*] OTIBCAUJ love2d scaffold
• [*] DLQMM265 scroll past first page

Change contents

• edit in main.lua at line 127
  [5.545]

  [2.3]
  + assert(Screen_top1.line < Cursor1.line or (Screen_top1.line == Cursor1.line and Screen_top1.pos <= Cursor1.pos))