Replace icon for JOptionPane with nicer icons

[revivius]

Replace icon for JOptionPane with nicer icons

[granella]

Github was unstable in this early hours :)
closed PR for my branch and adding correct PR

[AlexFalappa]

@granella: do you think to open a PR for improving the JOptionPane icons also against the original Darcula project?

I would be interested in that. It seems to me that the original project is stalling, I would be in favour maintaining an improved fork of the LAF alone where contributions like yours could be integrated.

Since a lot of improvements seem to come from this project why not let @Revivius create it?

[Revivius]

@AlexFalappa modifications and fixes we are performing takes effect only when loaded by NetBeans Platform. For example, try placing a JToggleButton in Form Designer and notice that how different it is from the 'Source' button in editor multiview. Form Designer is using unmodified Darcula LAF and hence has different borders for buttons for instance. Long story short, I think contributing to or forking original LAF should be the route we take eventually.

[Revivius]

Fixed with merging of PR #50. Thank you @granella !

[AlexFalappa]

@Revivius I played a bit with the Darcula LAF using it in some test Swing apps and found some lacks indeed.

An evident lack is missing JToggleButton styling as you highlighted. Other lacks I found are bad JOptionPane icons, less than optimal TitledBorder appearance, no JButton prelighting on mouse hover and no pressed state, no styling of JSplitPane (there is a pull request for this in the Darcula project however).

I plan on tackling the JToggleButton support, I'll keep you informed