things seem to feel snappier now

Dependencies

• [2] VC2CU2GG faster paste
• [3] OJBGNAN6 slight reorg in Readme
• [4] 34TC5SYK record another known issue I don't know how to fix yet
• [5] EV36VCVF another known issue
• [6] A2TQYJ6J .
• [7] 73OCE2MC after much struggle, a brute-force undo
• [8] 242L3OQX bugfix: ensure Cursor_line is always on a text line
• [9] VJ77YABH more efficient undo/redo
• [10] IDGP4BJZ new known issue with drawings
• [11] TCNHUMIW one more known issue
• [12] FS2ITYYH record a known issue

Change contents

• edit in README.md at line 72
  [4.148]→[4.8363:8364](∅→∅),[4.8364]→[3.18:62](∅→∅)
  −

  − * Undo/redo can be sluggish in large files.
• replacement in README.md at line 73
  [4.15]→[2.445:703](∅→∅)
  − * Large files may grow sluggish in other ways. I've noticed in 100KB files

  − that closing the window can take a few seconds. And it seems to take longer

  − in proportion to how far down my edits are. The phenomenon persists even if

  − I take out undo history.
  [4.15]

  [4.276]
  + * Undo/redo may be sluggish in large files. Large files may grow sluggish in

  + other ways.