bit more polish to help screen

Dependencies

• [2] PWHZPJJM always show current filename in window title
• [3] 6J6EEUAY respect zoom when printing online help
• [4] WDWXNW7V slightly strange way to move points
• [5] 2KRK3OBV don't rely on defaults
• [6] CXCAERTB icons for current_mode
• [7] JS6JSYOT online contextual help
• [8] 2FBLO5FH adjust window size
• [9] RJGZD4IN binary search to most natural up/down with proportional fonts
• [10] W4UVZETR 2 regressions:
• [*] OTIBCAUJ love2d scaffold

Change contents

• replacement in main.lua at line 69
  [2.43]→[4.2:43](∅→∅),[4.208]→[4.2:43](∅→∅)
  − drawingw = math.floor(screenh/2/40)*40
  [2.43]

  [4.2]
  + drawingw = math.floor(screenw/2/40)*40
• replacement in main.lua at line 745
  [4.478]→[4.478:576](∅→∅)
  − local drawing = select_drawing_at_mouse()

  − if drawing then

  − drawing.show_help = false
  [4.478]

  [4.533]
  + for _,line in ipairs(lines) do

  + if line.mode == 'drawing' then

  + line.show_help = false

  + end
• edit in main.lua at line 1074
  [4.674]→[4.674:750](∅→∅)
  − love.graphics.rectangle('line', 16,drawing.y, drawingw,pixels(drawing.h))
• edit in main.lua at line 1113
  [3.1372]

  [4.1988]
  + love.graphics.rectangle('line', 16,drawing.y, drawingw, math.max(pixels(drawing.h),y-drawing.y))