linecount: optimise when no counting needed.

If a mark wasn't passed, and the pane count is up to date, there is no
need to do anything, so optimise it all away.

Signed-off-by: NeilBrown <neil@brown.name>

diff --git a/lib-linecount.c b/lib-linecount.c
index 2572086601507eafcd45b8707e8147ca23f1f656..ba51efa1ff6ac57b69886e7c18d7ac41b0edd763 100644 (file)
--- a/lib-linecount.c
+++ b/lib-linecount.c
@@ -126,6 +126,10 @@ static void count_calculate(struct pane *p safe,
        int lines, words, chars, l, w, c;
        struct mark *m, *m2;
 
+       if (!end && attr_find(p->attrs, "lines"))
+               /* nothing to do */
+               return;
+
        m = vmark_first(p, type, owner);
        if (m == NULL || doc_prior(p, m) != WEOF) {
                /* No mark at doc start, make some */