Merge upstream into main

Dependencies

• [2] 7CEOB56D Merge upstream into main
• [3] UPCIYZEU drop an unnecessary level of indent
• [4] 2RXZ3PGO beginning of a new approach to scroll+wrap
• [5] MP2TBKU6 bugfix: crash in Text.up() after return
• [6] EGH7XDBK support non-text lines in Text.to2
• [7] IMEJA43L snapshot
• [8] PNGWLAFN Merge upstream into main
• [9] APYPFFS3 call edit rather than App callbacks in tests
• [10] MXA3RZYK deduce left/right from state where possible
• [11] CZB4CK2R bugfix
• [12] NDHQN23G done passing left/right margins everywhere
• [13] 356GY7IQ unify two similar functions
• [14] YW2GO3U4 bugfix: crash in Text.up() after return
• [15] LF7BWEG4 group all editor globals
• [16] S2YQBEYC snapshot: test for a new regression
• [17] M6TH7VSZ rip out notion of Line_width
• [18] IWYLK45K clicking to the right of a line within line width
• [19] QYIFOHW3 first test!
• [20] 5DOTWNVM right margin
• [21] HGC5RGJP switch to line index in a function
• [22] 27DROQW2 Merge upstream into main
• [23] PFT5Y2ZY move
• [24] QCPXQ2E3 add state arg to a few functions
• [25] KURLAXXI clean up some prints
• [26] HOSPP2AN crisp font rendering
• [27] ULKLJBN6 couple of renames
• [28] EMHRPJ3R no, that's not right
• [29] LXTTOB33 extract a couple of files
• [30] 4VKEE43Z bugfix
• [31] DGK5BPVI bugfix: UTF-8 in compute_fragments
• [32] GL4Q5WCV keep text from overflowing right margin
• [33] DRFE3B3Z mouse buttons are integers, not strings
• [*] BULPIBEG beginnings of a module for the text editor

Change contents

• replacement in text_tests.lua at line 533
  [4.981]→[2.2:156](∅→∅)
  − check_eq(Editor_state.cursor1.pos, 15, 'F - test_click_on_wrapping_line_containing_non_ascii/cursor') -- one more than the number of UTF-8 code-points
  [4.981]

  [4.2]
  + check_eq(Editor_state.cursor1.pos, 15, 'F - test_click_past_end_of_wrapping_line_containing_non_ascii/cursor') -- one more than the number of UTF-8 code-points
• edit in text_tests.lua at line 1968
  [4.43800]→[2.258:258](∅→∅),[4.981]→[4.1685:1848](∅→∅),[4.981]→[4.1685:1848](∅→∅)
  −

  − check_eq(Editor_state.cursor1.pos, 15, 'F - test_click_past_end_of_wrapping_line_containing_non_ascii/cursor') -- one more than the number of UTF-8 code-points
• resolve order conflict in text_tests.lua at line 1968
  [4.43800]
• edit in text.lua at line 99
  [4.910]→[4.3:77](∅→∅),[4.910]→[4.3:77](∅→∅),[4.910]→[4.3:77](∅→∅),[4.77]→[4.6:6](∅→∅),[4.77]→[4.6:6](∅→∅)
  − local boffset = Text.offset(frag, bpos+1) -- byte _after_ bpos

  −
• edit in text.lua at line 839
  [4.360]→[4.837:874](∅→∅),[4.360]→[4.837:874](∅→∅),[4.874]→[4.22:22](∅→∅),[4.874]→[4.22:22](∅→∅)
  − local offset = Text.offset(s, pos)

  −