Force rebuild of display table after removals

Table_compact() is called after Table_cleanupRow(), which might remove
rows, which are still referenced by the display table.  Set needsSort to
true so that Table_updateDisplayList() always performs a rebuild and
does access removed rows.

Fixes: #1517

Table.h

@@ -88,6 +88,7 @@ void Table_cleanupRow(Table* this, Row* row, int idx);
 
 static inline void Table_compact(Table* this) {
    Vector_compact(this->rows);
+   this->needsSort = true;
 }
 
 #endif