No line spacing when using drawline

@NebbishHacker
Your suggestion on using getModified was "spot on", shame on me ;-)

Here's my latest code including a random 'drawString` to check that the override is now OK. Seems that it's perfect for me now.

Ofcourse it requires some bookkeeping of the m variable if you change to a complete different screen.

var m=0;

// override drawString function to:
// - allocate proper line spacing between successive lines (here 5 pixels)
// - clear the area where the previous drawString was displayed
g._ds = g.drawString;
g.drawString = function(s,x,y) {
  s=s.toString();
  sa=s.split("\n");
  spacing=5+g.getFontHeight();

  g.clearRect(m.x1, m.y1, m.x2, m.y2); // Will clear the precise area affected by the previous drawString calls

  g.getModified(true); // Reset modified area

  sa.forEach(function(line){    
    //call the original drawString
    g._ds(line,x,y);
    y+=spacing;
  });    
  m=g.getModified(); // save modified area for clearing on next drawString
};



// write a random string of random size at random x and y positions
setInterval(function () {
  g.setFontVector(80*Math.random());
  g.setColor(1,0,0);
  getal=1000*Math.random();
  getal=getal.toFixed(0);
  g.drawString(getal,Math.random()*239,Math.random()*239);
  
}, 1000);

g.clear();