RFR: 4893524: Swing drop targets should call close() on transferred readers and streams

[Alexey Ivanov]

On Wed, 26 Jul 2023 07:15:56 GMT, Prasanta Sadhukhan <psadhukhan at openjdk.org> wrote:

> The issue here is a Reader(stream) is requested to handle a drop, via  DataFlavor.getReaderForText(), and then the reader is completely read, but it isn't closed. It should be closed as soon as possible to release some native resources.
> Fix is made to close the stream after it is being used

Shall we also update the copyright year in `BasicTextUI`?

src/java.desktop/share/classes/javax/swing/plaf/basic/BasicTextUI.java line 2613:

> 2611: 
> 2612:                     handleReaderImport(r, c, useRead);
> 2613:                     r.close();

Should we use try-with-resources for Reader? This will ensure the stream is closed even if `handleReaderImport` throws an exception.

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PR Review: https://git.openjdk.org/jdk/pull/15033#pullrequestreview-1554394185
PR Review Comment: https://git.openjdk.org/jdk/pull/15033#discussion_r1279064741