JEditableCheckBox paint a border in a color

[vdaburon]

JEditableCheckBox paint a border in a color (likes Very Light Blue) to help differentiation to Standard Checkbox (no border) and Editable Checkbox (with color border).

Description

JEditableCheckBox paint a border in a color (likes Very light blue)

Motivation and Context

Since 5.6.x some checkboxes could be change in an expression (right click on checkbox) but there is no external information to explains if the checkbox is "standard" or "expression compatible".

How Has This Been Tested?

Change border color to Orange, Blue and Very Light Blue (not standard color).

Use the "HTTP Request" as demo because some checkbox are standard checkbox and some checkbox are editable checkbox (Expression)

Screenshots (if appropriate):

Border Color.ORANGE

Border Color.BLUE

Border Color(51,204,255) Very Light Blue my prefered color

Border Color(51,204,255) Very Light Blue in Darcula look and feel

Types of changes

• New feature just aesthetic.
  Link to https://github.com/apache/jmeter/issues/6377

Checklist:

• [x ] My code follows the code style of this project.
• [ ] I have updated the documentation accordingly.

[vdaburon]

Currently the color is hard coded in the Class with: Color(51,204,255) but the border color could be a new JMeter property likes : RGB Color: JEditableCheckBox.border.color=51,204,255 or standard Color: JEditableCheckBox.border.color=ORANGE