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acme: avoid useless tagline/window redraw if not needed

window resize is only neccesary if tagline changed.

--- a/sys/src/cmd/acme/wind.c

+++ b/sys/src/cmd/acme/wind.c

@@ -387,6 +387,8 @@

 	int i;

 	texttype(t, r);

+	if(t->what == Tag)

+		w->tagsafe = FALSE;

 	if(t->what == Body)

 		for(i=0; i<t->file->ntext; i++)

 			textscrdraw(t->file->text[i]);

@@ -447,6 +449,7 @@

 		old = runemalloc(w->tag.file->nc+1);

 		bufread(w->tag.file, 0, old, w->tag.file->nc);

 		old[w->tag.file->nc] = '\0';

+		w->tagsafe = FALSE;

 	}

 	new = runemalloc(w->body.file->nname+100);

 	i = 0;

@@ -509,6 +512,7 @@

 				w->tag.q1 = q1+bar;

 			}

 		}

+		w->tagsafe = FALSE;

 	}

 	free(old);

 	free(new);

@@ -526,9 +530,8 @@

 	br.max.x = br.min.x + Dx(b->r);

 	br.max.y = br.min.y + Dy(b->r);

 	draw(screen, br, b, nil, b->r.min);

-

-	w->tagsafe = 0;

-	winresize(w, w->r, TRUE);

+	if(w->tagsafe == FALSE)

+		winresize(w, w->r, TRUE);

 }

 void