[8u] Request for approval: 8030953 SelectionVisible test should test multiline selection in case of TextArea

[Sergey Bylokhov]

Hello,
This is a direct back port from jdk 9 to jdk 8u.

Bug: https://bugs.openjdk.java.net/browse/JDK-8030953
Webrev can be found at: http://cr.openjdk.java.net/~serb/8030953/webrev.00
jdk9 changeset: http://hg.openjdk.java.net/jdk9/jdk9/jdk/rev/bf71e609b4c3

Reviewers: Petr Pchelko, Alexander Zvegintsev.

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Best regards, Sergey.