Outline panel hidden at inappropriate times

[Mael Hilléreau]

I'm on Mac OS 10.4.9, with 1.5.0rc1. In the two following situations,  
the outline panel is hidden whereas it should remain visible:

1. Open several documents (e.g. User's guide and Introduction), show  
the outline, and close one of the documents;

2. Open one or more documents, show the outline, and execute a buffer- 
switch command (M-x, "buffer-switch", enter) with or without the  
optional parameter.

Anyone can confirm that this is a bug?

Mael.