+-------------------+---------------------+
|                   |                     |
|                   |                     |
|                   |                     |
|    long file      |      scratch        |
|                   |                     |
|                   |                     |
|                   |                     |
|                   |                     |
+                   +---------------------+
|                   |                     |
|                   |                     |
|                   |                     |
|                   |       scratch       |
|                   |                     |
|                   |       (g TAB        |
|                   |                     |
|                   |                     |
|                   |                     |
+-------------------+---------------------+

+-------------------+---------------------+
|                   |                     |
|                   |                     |
|                   |                     |
|    long file      |      scratch        |
|  (gets scrolled)  |                     |
|                   |                     |
|                   |                     |
|                   |                     |
+-------------------+---------------------+
|                   |                     |
|                   |                     |
|                   |                     |
|   *Completions*   |       scratch       |
|     (should be    |                     |
|      scrolled)    |       (g TAB        |
|                   |                     |
|                   |                     |
|                   |                     |
+-------------------+---------------------+