Keyboard short cuts for zooming in Textadept

zoom.lua

keys['c+'] = {function()
  local buffer = buffer
  buffer.zoom = buffer.zoom + 1
  local c = _SCINTILLA.constants
  buffer.margin_width_n[0] = 4 * buffer:text_width(c.STYLE_LINENUMBER, "9")
end
}

keys['c-'] = {function()
  local buffer = buffer
  buffer.zoom = buffer.zoom - 1
  local c = _SCINTILLA.constants
  buffer.margin_width_n[0] = 4 * buffer:text_width(c.STYLE_LINENUMBER, "9")
end
}