<Swing Dev> RFR: 8272148: JDesktopPane:getComponentCount() returns one extra than expected with GTKLookAndFeel

[Pankaj Bansal]

A container may include few default components as children, which are added to it during creation. Due to this, calling function getChildrenCount on a new created instance may return non zero value. This behaviour may vary according to L&F also, as some L&F may add some default components to a container, but other L&F may choose not to do so.

The current bugs reports that this behaviour looks suspicious as it is expected that a newly created container will have zero  children.

Current specification is not clear on this whether it is allowed for a container to contain default components or not. The fix make changes to the specification to clarify the same.

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Commit messages:
 - 8272148: JDesktopPane:getComponentCount() returns one extra than expected with GTKLookAndFeel

Changes: https://git.openjdk.java.net/jdk/pull/5121/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=5121&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8272148
  Stats: 6 lines in 1 file changed: 6 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5121.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5121/head:pull/5121

PR: https://git.openjdk.java.net/jdk/pull/5121