top: speed up the collapsed children forest view logic

In forest view mode, once a collapsible parent process
and all of its children (if any) have been identified,
there is no longer a need to scan the remaining tasks.

So this patch will just force a new scan for any other
'Hide_pid' entries which might remain to be identified
after a targeted parent has been completely processed.

Signed-off-by: Jim Warner <james.warner@comcast.net>

top/top.c

@@ -4367,6 +4367,8 @@ static void forest_begin (WIN_t *q) {
                   }
                   // children found (and collapsed), so mark that puppy
                   if (children) rSv_Hid(parent) = 'x';
+                  // this will force a check of the next Hide_pid, if any
+                  j = PIDSmaxt;
                }
             }
          }