[rfc][icedtea-web][itweb-settings] Improve Icedtea-Web cache disk space

[Jie Kang]

> Hello,
> 
> Here is the updated patch on the cache size spinner that addresses the bug
> PR1857. A JLabel is now present under
> the spinner to tell the user available disk size and the maximum allowable
> number for the cache size. The spinner
> also changes colour to yellow when the user goes over 0.5% of the usable disk
> space. It turns to red if the user makes the spinner go past the usable disk
> space size and changes the JLabel to display a warning. Also the cache panel
> was put into a scroll pane so that the "view files" button is not in the
> default view or when resized to smaller.


Nice patch. Just a minor nit with the import statements:

+import javax.swing.*;
+import javax.swing.event.ChangeEvent;
+import javax.swing.event.ChangeListener;
+import java.awt.*;

Instead of importing the whole library please replace these with only the imports of specific classes that you need.

> 
> Thank you,
> Lukasz Dracz
> 

Thanks!

-- 

Jie Kang