RFR: 4893524: Swing drop targets should call close() on transferred readers and streams [v2]

[Prasanta Sadhukhan]

> 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

Prasanta Sadhukhan has updated the pull request incrementally with one additional commit since the last revision:

  Use try-with-resource

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/15033/files
  - new: https://git.openjdk.org/jdk/pull/15033/files/aafcd8df..62c816d9

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=15033&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=15033&range=00-01

  Stats: 15 lines in 1 file changed: 4 ins; 2 del; 9 mod
  Patch: https://git.openjdk.org/jdk/pull/15033.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15033/head:pull/15033

PR: https://git.openjdk.org/jdk/pull/15033