Fixed fill painting. And resulting problems with TaskPane.

Signed-off-by: weisj <weisj@arcor.de>

core/src/main/java/com/github/weisj/darklaf/ui/taskpane/DarkTaskPaneUI.java

@@ -111,11 +111,11 @@ public class DarkTaskPaneUI extends MetalTaskPaneUI {
             if (c.isOpaque()) {
                 g.setColor(c.getBackground());
                 g.setClip(clip.x, clip.x + h - arc, width, arc);
-                DarkUIUtil.fillRoundRect((Graphics2D) g, x, y, width - 1, h - 1, arc);
+                DarkUIUtil.fillRoundRect((Graphics2D) g, x - 1, y, width - 2, h - 1, arc);
             }
             g.setClip(clip.x, clip.y + h / 2 - 1, width, h / 2 + 2);
             g.setColor(color);
-            DarkUIUtil.paintLineBorder((Graphics2D) g, x, y, width - 1, h - 1, arc);
+            DarkUIUtil.paintLineBorder((Graphics2D) g, x + 1, y, width - 2, h - 1, arc);
             g.setClip(clip);
         }
 
@@ -141,19 +141,19 @@ public class DarkTaskPaneUI extends MetalTaskPaneUI {
                 g.setColor(titleBackgroundGradientStart);
             }
             if (isCollapsed()) {
-                DarkUIUtil.fillRoundRect(g, 0, 0, w - 1, h - 1, getRoundHeight());
+                DarkUIUtil.fillRoundRect(g, 1, 1, w - 2, h - 2, getRoundHeight());
                 g.setColor(borderColor);
-                DarkUIUtil.paintLineBorder(g, 0, 0, w - 1, h - 1, getRoundHeight());
+                DarkUIUtil.paintLineBorder(g, 1, 1, w - 2, h - 2, getRoundHeight());
             } else {
                 Rectangle clip = g.getClip().getBounds();
                 g.setClip(0, 0, w, h / 2 + 1);
 
-                DarkUIUtil.fillRoundRect(g, 0, 0, w - 1, h - 1, getRoundHeight());
+                DarkUIUtil.fillRoundRect(g, 1, 1, w - 2, h - 2, getRoundHeight());
                 g.setClip(0, h / 2 - 1, w, h / 2 + 2);
                 g.fillRect(0, 0, w, h);
                 g.setColor(borderColor);
                 g.setClip(0, 0, w, h / 2 + 1);
-                DarkUIUtil.paintLineBorder(g, 0, 0, w - 1, h - 1, getRoundHeight());
+                DarkUIUtil.paintLineBorder(g, 1, 1, w - 2, h - 2, getRoundHeight());
                 g.setClip(0, h / 2 - 1, w, h / 2 + 2);
                 DarkUIUtil.drawRect(g, 0, 0, w, h, 1);
                 g.setClip(clip);