ugly partial fix for bug

src/prompt.c

@@ -170,9 +170,21 @@ static void prompt_onKey(ToxWindow *self, Tox *m, wint_t key)
             wmove(self->window, prt->orig_y, X_OFST);
             fetch_hist_item(prt->line, &prt->pos, &prt->len, prt->ln_history, prt->hst_tot,
                             &prt->hst_pos, LN_HIST_MV_UP);
+
+            /* adjust line y origin appropriately when window scrolls down */
             if (prt->at_bottom && prt->len >= x2 - X_OFST) {
-                --prt->orig_y;
-                prt->scroll = true;
+                int px2 = prt->len >= x2 ? x2 : x2 - X_OFST;
+                int p_ofst = px2 != x2 ? 0 : X_OFST;
+
+                if (px2 <= 0)
+                    return;
+
+                int k = prt->orig_y + ((prt->len + p_ofst) / px2);
+
+                if (k == y2) {    /* cursor is below max_y */
+                    wprintw(self->window, "\n");
+                    --prt->orig_y;
+                }
             }
         }
     }

src/toxic_strings.c

@@ -119,7 +119,6 @@ void fetch_hist_item(wchar_t *buf, size_t *pos, size_t *len, wchar_t (*hst)[MAX_
         if (--(*hst_pos) < 0) {
             ++(*hst_pos);
             beep();
-            return;
         }
     } else {
         if (++(*hst_pos) == hst_tot) {