RFR: 6510914: JScrollBar.getMinimumSize() breaks the contract of JComponent.setMinimumSize()

[Prasanta Sadhukhan]

javadoc contract for JComponent.setMinimumSize(Dimension) states:

"Sets the minimum size of this component to a constant value. Subsequent calls to getMinimumSize will always return this value..."

However, JScrollBar overrides getMinimumSize() and breaks this contract - it always returns a minimum size derived from the preferred size even if you have previously called setMinimumSize()

Fix is made to check if mnimumSize is set and if so, honour it..

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Commit messages:
 - JDK-6510914: JScrollBar.getMinimumSize() breaks the contract of JComponent.setMinimumSize()
 - Merge branch 'master' of github.com:prsadhuk/jdk
 - Merge remote-tracking branch 'upstream/master'
 - Merge remote-tracking branch 'upstream/master'
 - Revert "Fix"
 - Fix

Changes: https://git.openjdk.org/jdk/pull/15325/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=15325&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-6510914
  Stats: 51 lines in 2 files changed: 51 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/15325.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15325/head:pull/15325

PR: https://git.openjdk.org/jdk/pull/15325