RFR: 8042054: JTree.updateUI uses out-of-date item size information

[Prasanta Sadhukhan]

On Wed, 12 Nov 2025 07:56:33 GMT, Prasanta Sadhukhan <psadhukhan at openjdk.org> wrote:

> `JTree.updateUI` calculate item sizes from the cell renderer, but it doesn't call `updateUI `on the cell renderer until afterwards. This leads to incorrect size calculation, which is observed when we switch from one L&F to another where it is seen that all tree items are slightly too cramped, with too little space between rows and text are abbreviated.
> Fix is to ensure `JTree.updateUI` update the cell renderer before updating the UI. 
> CI testing is ok..
> 
> Before fix
> <img width="142" height="146" alt="image" src="https://github.com/user-attachments/assets/95d43e47-122a-4ca4-8a3f-f4bf5c1d3f43" />
> 
> After fix
> <img width="145" height="125" alt="image" src="https://github.com/user-attachments/assets/068b5988-119c-4b99-be27-1ef5d52a28a2" />

Test updated..

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PR Comment: https://git.openjdk.org/jdk/pull/28258#issuecomment-3525447513