Scrolling fixes

Ensure scrolling is not interrupted by quotes ticker.

Redraw on Home/End.

Prevent scrolling too far down beyond the quotes.

cmd/mop/main.go

@@ -116,8 +116,10 @@ loop:
 						redrawQuotesFlag = true
 					} else if event.Key == termbox.KeyHome {
 						screen.ScrollTop()
+						redrawQuotesFlag = true
 					} else if event.Key == termbox.KeyEnd {
 						screen.ScrollBottom(len(profile.Tickers))
+						redrawQuotesFlag = true
 					}
 				} else if lineEditor != nil {
 					if done := lineEditor.Handle(event); done {
@@ -158,7 +160,7 @@ loop:
 
 		case <-quotesQueue.C:
 			if !showingHelp && !paused {
-				screen.Draw(quotes)
+				redrawQuotesFlag = true
 			}
 
 		case <-marketQueue.C:

screen.go

@@ -92,7 +92,7 @@ func (screen *Screen) ClearLine(x int, y int) *Screen {
 // Increase the offset for scrolling feature by n
 // Takes number of tickers as max, so not scrolling down forever
 func (screen *Screen) IncreaseOffset(n int, max int) {
-	if screen.offset + n + 1 < max {
+    if screen.offset + n < max - screen.height + screen.headerLine{
 		screen.offset += n
 	}
 }