Use tsetdirt in tscrollup and tscrolldown.

tscrollup and tscrolldown do not use tsetdirt, but their code is
equivalent to

        tsetdirt(orig, term.bot-n);
        tsetdirt(orig+n, term.bot);

tclearregion also marks cleared lines as dirty.
In tscrolldown it sets lines from term.bot-n+1 to term.bot dirty, and in
tscrollup it sets lines from orig to orig+n-1 dirty.

In both functions all lines from orig to term.bot are effectively set
dirty, but in tscrolldown lines from orig+n to term.bot are set dirty
twice, and in tscrollup lines from orig to term.bot-n are set dirty
twice.

These patches make it clear which lines are set dirty and sets them
dirty once in each funciton.

1 files changed, 4 insertions, 6 deletions

diff --git a/st.c b/st.c
index b66791a..d188b35 100644
--- a/st.c
+++ b/st.c
@@ -1399,14 +1399,13 @@ tscrolldown(int orig, int n) {
         LIMIT(n, 0, term.bot-orig+1);
 
         tclearregion(0, term.bot-n+1, term.col-1, term.bot);
+        tsetdirt(orig, term.bot-n);
+        tsetdirt(orig+n, term.bot);
 
         for(i = term.bot; i >= orig+n; i--) {
                 temp = term.line[i];
                 term.line[i] = term.line[i-n];
                 term.line[i-n] = temp;
-
-                term.dirty[i] = 1;
-                term.dirty[i-n] = 1;
         }
 
         selscroll(orig, n);
@@ -1419,14 +1418,13 @@ tscrollup(int orig, int n) {
         LIMIT(n, 0, term.bot-orig+1);
 
         tclearregion(0, orig, term.col-1, orig+n-1);
+        tsetdirt(orig, term.bot-n);
+        tsetdirt(orig+n, term.bot);
 
         for(i = orig; i <= term.bot-n; i++) {
                  temp = term.line[i];
                  term.line[i] = term.line[i+n];
                  term.line[i+n] = temp;
-
-                 term.dirty[i] = 1;
-                 term.dirty[i+n] = 1;
         }
 
         selscroll(orig, -n);