[jfx15] RFR: 8176270: Adding ChangeListener to TextField.selectedTextProperty causes StringOutOfBoundsException [v8]

[Ajit Ghaisas]

On Fri, 10 Jul 2020 06:14:15 GMT, Robert Lichtenberger <rlichten at openjdk.org> wrote:

>> This PR fixes JDK-8176270 by clamping the end index of the selected text to the length of the text.
>
> Robert Lichtenberger has updated the pull request incrementally with one additional commit since the last revision:
> 
>   8176270: Adding ChangeListener to TextField.selectedTextProperty causes StringOutOfBoundsException
>   
>   Fix check condition in RTest.
>   Replace underscore based variable names.

Marked as reviewed by aghaisas (Reviewer).

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PR: https://git.openjdk.java.net/jfx/pull/138