[dev] [st] Patch to fix selection rendering

[Tarmo Heiskanen]

Latest st revision introduces dirtyness handling but it wasn't
implemented for selections. This patch here corrects that and
selections are rendered correctly again. BTW, dirtyness thing made st
fast enough to be usable as main terminal, thanks for that. ;)

diff -r fb96d95c5174 st.c
--- a/st.c      Thu Oct 20 23:20:59 2011 +0200
+++ b/st.c      Fri Oct 28 16:44:57 2011 +0300
@@ -463,6 +463,9 @@
        if(IS_SET(MODE_MOUSE))
                mousereport(e);
        else if(e->xbutton.button == Button1) {
+               if(sel.bx != -1)
+                       for(int i=sel.b.y; i<=sel.e.y; i++)
+                               term.dirty[i] = 1;
                sel.mode = 1;
                sel.ex = sel.bx = X2COL(e->xbutton.x);
                sel.ey = sel.by = Y2ROW(e->xbutton.y);
@@ -583,6 +586,7 @@
        else if(e->xbutton.button == Button1) {
                sel.mode = 0;
                getbuttoninfo(e, NULL, &sel.ex, &sel.ey);
+               term.dirty[sel.ey] = 1;
                if(sel.bx == sel.ex && sel.by == sel.ey) {
                        struct timeval now;
                        sel.bx = -1;
@@ -627,7 +631,9 @@
                if(oldey != sel.ey || oldex != sel.ex) {
                        int starty = MIN(oldey, sel.ey);
                        int endy = MAX(oldey, sel.ey);
-                       drawregion(0, (starty > 0 ? starty : 0), term.col, 
(endy < term.row ? endy+1 : term.row));
+                       for(int i=starty; i<=endy; i++)
+                               term.dirty[i] = 1;
+                       draw();
                }
        }
 }