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travis-ci

Restore correct sizes of many-splitted layout

Fix bug where layout trees with a nesting level of at least 2 sometimes
restored wrong sizes for windows. For example, restoring this saved
layout:
+-----+-----------------+-----------+
|     |                 |           |
|     |                 |     4     |
|  1  |        2        |           |
|     |                 +-----------+
|     |                 |           |
+-----+-----------------+           |
|          3            |     5     |
|                       |           |
+-----------------------+-----------+

Would be result in this layout:
+--------------+--------+-----------+
|              |        |           |
|              |        |     4     |
|      1       |   2    |           |
|              |        +-----------+
|              |        |           |
+--------------+--------+           |
|          3            |     5     |
|                       |           |
+-----------------------+-----------+

13 of 13 new or added lines in 1 file covered. (100.0%)

855 of 1293 relevant lines covered (66.13%)

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