RFR: 8209788: Left/Right/Ctrl+A keys not working in editor of ComboBox if popup showing [v3]

[Ambarish Rapte]

On Thu, 23 Jul 2020 17:57:34 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

>> Ambarish Rapte has updated the pull request incrementally with two additional commits since the last revision:
>> 
>>  - revert unintended line deletion
>>  - changes to address to review
>
> Once the merge conflicts and review comments are addressed, I'll put this back on my review queue.

Please review the updated change:

1. Changed the approach to add a property named `removeKeyMappingsForComboBoxEditor` to ListView when creating it from
ComboBox. Please do suggest if this name sounds Ok. 2. When this property is present some KeyMappings that are needed
for ComboBox Editor get removed from `ListViewBehavior`. 3. I have considered to remove some more KeyMappings which
seem like they should be passed on to ComboBox's Editor.(method `removeKeyMappingsForComboBoxEditor()`) 4. There is an
existing issue with `BehaviorBase`: [JDK-8250807](https://bugs.openjdk.java.net/browse/JDK-8250807). Due to this issue,
KeyMappings from child `InputMap` do not get removed. So the keys CTRL+SHIFT+HOME and CTRL+SHIFT+END will still not
work with ComboBox editor. 5. Updated ComboBoxTest for additional keys. 6. Keeping the tests added for ListView, as
they seem reasonable and not present already.

Change is very specific to ComboBox editor, so it should not affect any other tests.

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