RFR: 8281384: Random chars on paste from Windows clipboard [v4]

[Oliver Schmidtmer]

> Windows programs may reuse a clipboard buffer that is larger than the new content. In this case de NUL terminator is not at the end of the buffer, but within it. 
> The current implementation copys the whole buffer into a text field, including the NUL terminator and the remaining chars.
> 
> The JIRA ticket contains a JNA based sample program, which prefills the buffer for demonstrating this issue.
> If this should be added as a unit test, I'm open for advice how to do that.

Oliver Schmidtmer has updated the pull request incrementally with one additional commit since the last revision:

  cleanup

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

Changes:
  - all: https://git.openjdk.org/jfx/pull/1724/files
  - new: https://git.openjdk.org/jfx/pull/1724/files/57dcbedc..56e75dd6

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jfx&pr=1724&range=03
 - incr: https://webrevs.openjdk.org/?repo=jfx&pr=1724&range=02-03

  Stats: 3 lines in 1 file changed: 0 ins; 1 del; 2 mod
  Patch: https://git.openjdk.org/jfx/pull/1724.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1724/head:pull/1724

PR: https://git.openjdk.org/jfx/pull/1724