RFR: 8209788: Left/Right/Ctrl+A keys not working in editor of ComboBox if popup showing [v8]

[Ambarish Rapte]

On Fri, 28 Aug 2020 17:49:57 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

> Would it be possible to add some tests to verify the behavior of HOME and END for editable and non-editable ComboBox
> controls?

@kevinrushforth @kleopatra
Please check the updated changes. _ComboBoxTest_ and _ListViewTest_ both have minor modifications in how they access
_KeyMappings_. and added test for verifying **HOME** and **END** key with both editable and non editable ComboBox.

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PR: https://git.openjdk.java.net/jfx/pull/172