Remember to still update the cursor position when it's within an enti…

…re skipped range of rows at reflow time

src/screen.c

@@ -595,8 +595,15 @@ static void resize_buffer(VTermScreen *screen, int bufidx, int new_rows, int new
         new_row_start, new_row_end, old_row_start, old_row_end, width);
 #endif
 
-    if(new_row_start < 0)
+    if(new_row_start < 0) {
+      if(old_row_start <= old_cursor.row && old_cursor.row < old_row_end) {
+        new_cursor.row = 0;
+        new_cursor.col = old_cursor.col;
+        if(new_cursor.col >= new_cols)
+          new_cursor.col = new_cols-1;
+      }
       break;
+    }
 
     for(new_row = new_row_start, old_row = old_row_start; new_row <= new_row_end; new_row++) {
       int count = width >= new_cols ? new_cols : width;

t/69screen_reflow.test

@@ -77,3 +77,12 @@ RESIZE 5,16
   ?lineinfo 3 =
   ?screen_row 3 = "> "
   ?cursor = 3,2
+
+!Cursor goes missing
+# For more context: https://github.com/neovim/neovim/pull/21124
+RESET
+RESIZE 5,5
+RESIZE 3,1
+PUSH "\x1b[2;1Habc\r\n\x1b[H"
+RESIZE 1,1
+  ?cursor = 0,0