Fixed string property for tooltip style not being respected.

core/src/main/java/com/github/weisj/darklaf/ui/tooltip/DarkTooltipUI.java

@@ -349,8 +349,9 @@ public class DarkTooltipUI extends BasicToolTipUI implements PropertyChangeListe
         }
     }
 
-    private ToolTipStyle getStyle(final Object style) {
+    public static ToolTipStyle getStyle(final Object style) {
         if (style instanceof ToolTipStyle) return (ToolTipStyle) style;
+        if (style == null) return null;
         String name = style.toString();
         if (VARIANT_PLAIN_BALLOON.equals(name)) return ToolTipStyle.PLAIN_BALLOON;
         if (VARIANT_BALLOON.equals(name)) return ToolTipStyle.BALLOON;

core/src/main/java/com/github/weisj/darklaf/ui/tooltip/ToolTipUtil.java

@@ -133,7 +133,8 @@ public class ToolTipUtil {
         if (context instanceof ToolTipContext) {
             return (ToolTipContext) context;
         }
-        if (ToolTipStyle.BALLOON.equals(comp.getClientProperty(DarkTooltipUI.KEY_STYLE))) {
+        Object style = comp.getClientProperty(DarkTooltipUI.KEY_STYLE);
+        if (ToolTipStyle.BALLOON.equals(DarkTooltipUI.getStyle(style))) {
             return DEFAULT_CONTEXT;
         }
         return null;

core/src/test/java/ui/toolTip/ToolTipDemo.java

@@ -47,6 +47,7 @@ public class ToolTipDemo implements ComponentDemo {
                                                            .setCenterAlignment(Alignment.SOUTH);
         button.putClientProperty(DarkTooltipUI.KEY_CONTEXT, context);
         button.setToolTipText("This is the ToolTip demo text!");
+        button.putClientProperty(DarkTooltipUI.KEY_STYLE, DarkTooltipUI.VARIANT_BALLOON);
 
         JPanel controlPanel = panel.addControls();