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    commit 98b6f84bfcb63cff54f8aee87191432fa769346c
    parent 66669a558560c0ba3b5da4cd2009de81d68a2263
    Author: Roberto E. Vargas Caballero <k0ga@shike2.com>
    Date:   Tue,  4 Sep 2012 20:33:01 +0200

    Check alternative screen before drawing box selection

    Some programs use the alternative screen (vi, less, ...), whose
    content is different of the main screen. If you select text in one of
    the screen, you don't wait the box selection is painted in the other
    screen, so it is necessary check if the selection was done in the same
    screen we are going to paint. Before to this commit, you could do
    something like:

    	$ LESS="" ls | less
    	(select some code)
    	q

    and selection box remains drawing in the main screen, but the content
    of selection keeps text of the alternate screen.
    ---
     st.c |    7 ++++++-
     1 file changed, 6 insertions(+), 1 deletion(-)
    Diffstat:
    Mst.c | 7++++++-

    1 file changed, 6 insertions(+), 1 deletion(-)
    diff --git a/st.c b/st.c
    @@ -221,6 +221,7 @@ typedef struct {
     	struct {int x, y;} b, e;
     	char *clip;
     	Atom xtarget;
    +	bool alt;
     	struct timeval tclick1;
     	struct timeval tclick2;
     } Selection;
    @@ -579,6 +580,7 @@ selcopy(void) {
     		}
     		*ptr = 0;
     	}
    +	sel.alt = IS_SET(MODE_ALTSCREEN);
     	xsetsel(str);
     }

    @@ -2076,7 +2078,10 @@ drawregion(int x1, int y1, int x2, int y2) {
     	int ic, ib, x, y, ox, sl;
     	Glyph base, new;
     	char buf[DRAW_BUF_SIZ];
    +	bool ena_sel = sel.bx != -1, alt = IS_SET(MODE_ALTSCREEN);

    +	if((sel.alt && !alt) || (!sel.alt && alt))
    +		ena_sel = 0;
     	if(!(xw.state & WIN_VISIBLE))
     		return;

    @@ -2089,7 +2094,7 @@ drawregion(int x1, int y1, int x2, int y2) {
     		ic = ib = ox = 0;
     		for(x = x1; x < x2; x++) {
     			new = term.line[y][x];
    -			if(sel.bx != -1 && *(new.c) && selected(x, y))
    +			if(ena_sel && *(new.c) && selected(x, y))
     				new.mode ^= ATTR_REVERSE;
     			if(ib > 0 && (!(new.state & GLYPH_SET) || ATTRCMP(base, new) ||
     						  ib >= DRAW_BUF_SIZ-UTF_SIZ)) {