Fix cursor to end hard coded fo 24 lines

src/toolsrc/ed.pla

@@ -534,8 +534,8 @@ def drawrows(toprow, bottomrow)#0
     tens, ones = divmod(tens, 10)
     for row = toprow to bottomrow
         scrnrow = row + viewtop
-        conio:gotoxy(0, row)
         if scrnrow < numlines
+            conio:gotoxy(0, row)
             if flags & gutter
                 seperator = viewleft ?? '<' :: ' '
                 if flags & selection
@@ -561,8 +561,6 @@ def drawrows(toprow, bottomrow)#0
                 conio:putchars(numchars, strptr + viewleft + 1)
                 conio:clear(cleol)
             fin
-        else
-            conio:clear(cleol)
         fin
     next
 end
@@ -619,10 +617,10 @@ def curshome#0
     drawscrn
 end
 def cursend#0
-    if numlines > 23
+    if numlines > scrnheight - 1
         cursrow  = numlines - 1
-        cursy    = 23
-        viewtop  = cursrow - 23
+        cursy    = scrnheight - 1
+        viewtop  = cursrow - scrnheight - 1
     else
         cursrow  = numlines - 1
         cursy    = numlines - 1