Fix L&F nimbus too slow.

Normand Briere

2019-08-17 5892f05411c3d4dce2d8a59e0966dc2e1843a971

 cButton.java
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@@ -26,7 +26,7 @@
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     {
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         super(icon);
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-        setMargin(new java.awt.Insets(-1, -1, -1, -1));
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+        setMargin(new java.awt.Insets(1, 10, 1, 10)); // ??
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 //result = new JButton( icon );
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 //result.setBorderPainted( false );