Merge upstream into main

Dependencies

• [2] 7CEOB56D Merge upstream into main
• [3] ILOA5BYF separate data structure for each line's cache data
• [4] XNFTJHC4 split keyboard handling between Text and Drawing
• [5] KAUD3YIK tests: deleting points/shapes
• [6] HMODUNJE scroll on backspace
• [7] OGUV4HSA remove some memory leaks from rendered fragments
• [8] PX7DDEMO autosave slightly less aggressively
• [9] 27DROQW2 Merge upstream into main
• [10] OWK3U6VD tests for drawing polygons
• [11] M6TH7VSZ rip out notion of Line_width
• [12] 2JLVAYHB start decoupling editor tests from App
• [13] 2RXZ3PGO beginning of a new approach to scroll+wrap
• [14] IWYLK45K clicking to the right of a line within line width
• [15] UHB4GARJ left/right margin -> left/right coordinates
• [16] SPSW74Y5 add state arg to Text.keychord_pressed
• [17] QCPXQ2E3 add state arg to a few functions
• [18] LF7BWEG4 group all editor globals
• [19] LNUHQOGH start passing in Editor_state explicitly
• [20] LSYLEVBD drop some redundant args when clearing the cache
• [21] EQP53UQV autosave slightly less aggressively
• [22] PTDO2SOT add state arg to schedule_save
• [23] AYE2VEGJ extract a couple of methods
• [24] 42LVB4DE test: naming a point
• [25] 7LVK4KRD fix a failing test
• [26] CNCYMM6A make test initializations a little more obvious
• [27] OEUU62GM Merge upstream into main
• [*] LXTTOB33 extract a couple of files
• [*] BULPIBEG beginnings of a module for the text editor
• [*] K2X6G75Z start writing some tests for drawings

Change contents

• edit in text_tests.lua at line 481
  [4.202]→[4.248:335](∅→∅),[4.248]→[4.248:335](∅→∅),[4.202]→[4.248:335](∅→∅),[4.1505]→[4.248:335](∅→∅),[4.3904]→[4.248:335](∅→∅),[4.248]→[4.248:335](∅→∅)
  − -- 0 1 2

  − -- 123456789012345678901
• edit in text.lua at line 226
  [4.3000]→[4.2756:2810](∅→∅),[4.3000]→[4.2756:2810](∅→∅)
  − Text.clear_cache(State.lines[State.cursor1.line])
• resurrect zombie in text.lua at line 227
  [4.122]→[4.2810:2865](∅→∅),[4.2810]→[4.2810:2865](∅→∅),[4.2810]→[4.2810:2865](∅→∅)
  + assert(Text.le1(State.screen_top1, State.cursor1))
• edit in drawing_tests.lua at line 341
  [4.116581]→[3.8968:9000](∅→∅),[4.116581]→[3.8968:9000](∅→∅)
  − Text.redraw_all(Editor_state)
• edit in drawing_tests.lua at line 528
  [4.122534]→[3.9298:9330](∅→∅),[4.122534]→[3.9298:9330](∅→∅),[4.123352]→[3.9331:9363](∅→∅),[4.123352]→[3.9331:9363](∅→∅)
  − Text.redraw_all(Editor_state)

  − Text.redraw_all(Editor_state)