clean up a cross-test leakage

Dependencies

• [2] CNCYMM6A make test initializations a little more obvious
• [3] CRYGI3LR more drawing tests
• [4] 7CLGG7J2 test: autosave after any shape
• [5] KAUD3YIK tests: deleting points/shapes
• [6] LYN3L74W correct commit f3abc2cbf2
• [7] 4AXV2HG4 all pending manual tests done!
• [8] M6TH7VSZ rip out notion of Line_width
• [9] 7DYUAOI6 test: undo moving point
• [10] OWK3U6VD tests for drawing polygons
• [11] Y4VYNEGF test: autosave after name/move/delete of point
• [12] LF7BWEG4 group all editor globals
• [13] 42LVB4DE test: naming a point
• [14] K2X6G75Z start writing some tests for drawings
• [15] FFBIY74N bugfix: 'escape' to cancel a stroke
• [16] L6XA5EY2 test: moving a point
• [17] UHB4GARJ left/right margin -> left/right coordinates
• [18] T7SJSJIH test: undo naming a point

Change contents

• edit in drawing_tests.lua at line 28
  [3.353]→[3.106069:106101](∅→∅)
  − Editor_state.filename = 'foo'
• edit in drawing_tests.lua at line 30
  [2.5922]

  [3.106208]
  + Editor_state.filename = 'foo'
• edit in drawing_tests.lua at line 133
  [3.188]→[3.109219:109251](∅→∅)
  − Editor_state.filename = 'foo'
• edit in drawing_tests.lua at line 135
  [2.6357]

  [3.109358]
  + Editor_state.filename = 'foo'
• edit in drawing_tests.lua at line 400
  [3.242]→[3.117639:117671](∅→∅)
  − Editor_state.filename = 'foo'
• edit in drawing_tests.lua at line 402
  [2.7517]

  [3.117778]
  + Editor_state.filename = 'foo'
• edit in drawing_tests.lua at line 445
  [3.112]→[3.118545:118577](∅→∅)
  − Editor_state.filename = 'foo'
• edit in drawing_tests.lua at line 447
  [2.7662]

  [3.118684]
  + Editor_state.filename = 'foo'
• edit in drawing_tests.lua at line 505
  [3.154]→[3.119761:119793](∅→∅)
  − Editor_state.filename = 'foo'
• edit in drawing_tests.lua at line 507
  [2.7807]

  [3.119900]
  + Editor_state.filename = 'foo'
• edit in drawing_tests.lua at line 532
  [3.158]→[3.120502:120534](∅→∅)
  − Editor_state.filename = 'foo'
• edit in drawing_tests.lua at line 534
  [2.7952]

  [3.120641]
  + Editor_state.filename = 'foo'
• edit in drawing_tests.lua at line 649
  [3.192]→[3.123898:123930](∅→∅)
  − Editor_state.filename = 'foo'
• edit in drawing_tests.lua at line 651
  [2.8532]

  [3.124037]
  + Editor_state.filename = 'foo'
• edit in drawing_tests.lua at line 699
  [3.118]→[3.124934:124966](∅→∅)
  − Editor_state.filename = 'foo'
• edit in drawing_tests.lua at line 701
  [2.8677]

  [3.125073]
  + Editor_state.filename = 'foo'
• edit in drawing_tests.lua at line 751
  [3.190]→[3.126021:126053](∅→∅)
  − Editor_state.filename = 'foo'
• edit in drawing_tests.lua at line 753
  [2.8822]

  [3.126160]
  + Editor_state.filename = 'foo'