RFR: 8273349: Check uses of Stream::peek in controls and replace as needed [v2]

[drmarmac]

> This PR removes potentially incorrect usages of Stream.peek().
> The changed code should be covered by the tests that are already present.

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

  Remove outdated comment

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Changes:
  - all: https://git.openjdk.org/jfx/pull/1430/files
  - new: https://git.openjdk.org/jfx/pull/1430/files/676ec3cf..1b285b5b

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jfx&pr=1430&range=01
 - incr: https://webrevs.openjdk.org/?repo=jfx&pr=1430&range=00-01

  Stats: 4 lines in 1 file changed: 0 ins; 4 del; 0 mod
  Patch: https://git.openjdk.org/jfx/pull/1430.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1430/head:pull/1430

PR: https://git.openjdk.org/jfx/pull/1430