Multi-row lines do not collapse! Puntuado con 4 de 5 estrellas

When the multi-row view is activated and I have more than 4 rows and want to close all tabs, right tabs, left tabs or other tabs, the space is only reduced to 4 rows instead of one row...

Please fix that!

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System: Windows XP SP3
Mozilla FireFox Version: 11.0
Mozilla FireFox Theme: Firefox 3 theme for Firefox 4+ 2.0.0

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