cleaner version of previous fix

st.c

@@ -3030,13 +3030,13 @@ drawregion(int x1, int y1, int x2, int y2)
 			continue;
 
 		/* draw from horizontally scrolled position */
-		/* ensure we draw at least the visible width, limited by actual line content */
-		int visible_width = MIN(x2, linelen - term.hscr);
-		if (visible_width < x2 && linelen > term.hscr) {
-			/* if line extends beyond what we calculated, draw more */
-			visible_width = MIN(x2, MAX(visible_width, term.col));
+		/* fix inconsistent line lengths: ensure we draw full terminal width when possible */
+		int draw_width = MIN(x2, linelen - term.hscr);
+		if (draw_width < x2 && linelen > term.hscr) {
+			/* expand to terminal width if line might have more content */
+			draw_width = x2;
 		}
-		xdrawline(&line[term.hscr], x1, y, visible_width);
+		xdrawline(&line[term.hscr], x1, y, draw_width);
 	}
 }