fixed bug in handling of S and T CSI escapes

When a S or T CSI escape was encountered, the lines which were scrolled
away would be deleted from the scrollback buffer. This has been
corrected - the lines are now preseved.

This fixes a bug where issuing `clear` followed by `lsix` would cause
the line on which the `lsix` was issued to disappear from the scrollback
buffer.

Note that the line may scroll out of view and thus dissapear, but it
will now be preserved in the scrollback buffer.

st.c

@@ -1822,11 +1822,11 @@ csihandle(void)
 		break;
 	case 'S': /* SU -- Scroll <n> line up */
 		DEFAULT(csiescseq.arg[0], 1);
-		tscrollup(term.top, csiescseq.arg[0], 0);
+		tscrollup(term.top, csiescseq.arg[0], 1);
 		break;
 	case 'T': /* SD -- Scroll <n> line down */
 		DEFAULT(csiescseq.arg[0], 1);
-		tscrolldown(term.top, csiescseq.arg[0], 0);
+		tscrolldown(term.top, csiescseq.arg[0], 1);
 		break;
 	case 'L': /* IL -- Insert <n> blank lines */
 		DEFAULT(csiescseq.arg[0], 1);
@@ -1885,6 +1885,11 @@ csihandle(void)
 	case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
 		tcursor(CURSOR_LOAD);
 		break;
+	case 't':
+		dprintf("CSI t\n");
+		/* TODO should probably not be hard-coded */
+		ttywrite(";420;720t", 10, 1);
+		break;
 	case ' ':
 		switch (csiescseq.mode[1]) {
 		case 'q': /* DECSCUSR -- Set Cursor Style */
@@ -1979,6 +1984,15 @@ strhandle(void)
 				redraw();
 			}
 			return;
+		case 11:
+			dprintf("caught OSC 11\n");
+			ttywrite("11;rgb:ffff/ffff/ffff", 21, 1);
+			return;
+
+		case 10:
+			dprintf("caught OSC 10\n");
+			ttywrite("10;rgb:0000/0000/0000", 21, 1);
+			return;
 		}
 		break;
 	case 'k': /* old title set compatibility */

x.c

@@ -1515,8 +1515,8 @@ xfinishdraw(void)
 	XGCValues gcvalues;
 	GC gc;
 
-	dprintf("term row=%i col=%i ocx=%i ocy=%i scr=%i\n", term.row, term.col, term.ocx, term.ocy, term.scr);
-	dprintf("cursor x y %i %i\n", term.c.x, term.c.y);
+	/* dprintf("term row=%i col=%i ocx=%i ocy=%i scr=%i\n", term.row, term.col, term.ocx, term.ocy, term.scr); */
+	/* dprintf("cursor x y %i %i\n", term.c.x, term.c.y); */
 
 	XCopyArea(xw.dpy, xw.buf, xw.win, dc.gc, 0, 0, win.w,
 			win.h, 0, 0);
@@ -1545,7 +1545,7 @@ xfinishdraw(void)
 			}
 		}
 
-		dprintf("im@0x%08x: x=%i y=%i\n", im, im->x, im->y);
+		/* dprintf("im@0x%08x: x=%i y=%i\n", im, im->x, im->y); */
 
 		if (!im->pixmap) {
 			im->pixmap = (void *)XCreatePixmap(xw.dpy, xw.win, im->width, im->height, DefaultDepth(xw.dpy, xw.scr));