# st

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    commit 3afdb4ff04b45a5e4209a56d5073341c9d506b38
    parent f9dc374ea01c2921ec3bd1214f292a7036d069ae
    Author: noname <noname@inventati.org>
    Date:   Sun, 20 Apr 2014 17:26:13 +0400

    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.

    Diffstat:
    Mst.c | 10++++------

    1 file changed, 4 insertions(+), 6 deletions(-)
    diff --git 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);