[Bug 122406] [sidebar] Switching panels disposes the UI element

[bu...@apache.org]

https://issues.apache.org/ooo/show_bug.cgi?id=122406

Andre <aw...@googlemail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |awf.aoo@googlemail.com
         Issue Type|DEFECT                      |ENHANCEMENT

--- Comment #1 from Andre <aw...@googlemail.com> ---
I am changing the issue type to enhancement.  I agree that a form of caching
might improve usability in a few cases but the state of most panels is defined
by items which belong to the document and therefore is already persistent.

Adding caching will open its own can of worms.  I did not implement caching of
panels because:

- No premature optimization.

- In the beginning the Impress panels where still tied to view shells.  Caching
them would have been a major undertaking.

- We don't have a performance problem (to my knowledge).

- Panels in the cache still need some parent window.  Changing parents of
controls that are not designed for that may or may not work.

- Caching panels of unknown implementation and complexity may require a good
caching strategy to avoid allocating too many resources.

- Most panels are not designed to be dormant for an extended period of time. 
They may have listeners and might react to events which can lead to unexpected
results.

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