1 files changed, 15 insertions, 2 deletions

diff --git a/st.c b/st.c
index f7f9de8..ed5481d 100644
--- a/st.c
+++ b/st.c
@@ -1060,12 +1060,25 @@ tresize(int col, int row) {
         int i;
         int minrow = MIN(row, term.row);
         int mincol = MIN(col, term.col);
+        int slide = term.c.y - row + 1;
 
         if(col < 1 || row < 1)
                 return;
 
-        /* free uneeded rows */
-        for(i = row; i < term.row; i++) {
+        /* free unneeded rows */
+        i = 0;
+        if(slide > 0) {
+                /* slide screen to keep cursor where we expect it -
+                 * tscrollup would work here, but we can optimize to
+                 * memmove because we're freeing the earlier lines */
+                for(/* i = 0 */; i < slide; i++) {
+                        free(term.line[i]);
+                        free(term.alt[i]);
+                }
+                memmove(term.line, term.line + slide, row * sizeof(Line));
+                memmove(term.alt, term.alt + slide, row * sizeof(Line));
+        }
+        for(i += row; i < term.row; i++) {
                 free(term.line[i]);
                 free(term.alt[i]);
         }