[Tracker] memory is not released after closing query window

[diver]

hrev58013

Tracker doesn't free up memory after using Find window and searching for all files and then closing query window

[jscipione]

Similar behavior on BeOS R5. I suspect icon cache is the cause.

[waddlesplash]

This actually may be due to how our malloc currently behaves. Does the same problem happen under the debug heap?

[diver]

Under the debug heap most of the memory gets released but not to the original value.