简化 JFXDialog 圆角 (#5836)

HMCL/src/main/java/com/jfoenix/controls/JFXDialog.java

@@ -49,7 +49,6 @@ import javafx.scene.image.WritableImage;
 import javafx.scene.input.MouseEvent;
 import javafx.scene.layout.Background;
 import javafx.scene.layout.BackgroundFill;
-import javafx.scene.layout.CornerRadii;
 import javafx.scene.layout.Region;
 import javafx.scene.layout.StackPane;
 import javafx.scene.paint.Color;
@@ -155,8 +154,6 @@ public class JFXDialog extends StackPane {
         });
 
         contentHolder = new StackPane();
-        contentHolder.getStyleClass().add("content-holder");
-        contentHolder.setBackground(new Background(new BackgroundFill(Color.WHITE, new CornerRadii(2), null)));
         JFXDepthManager.setDepth(contentHolder, 4);
         contentHolder.setPickOnBounds(false);
         // ensure stackpane is never resized beyond it's preferred size

HMCL/src/main/resources/assets/css/root.css

@@ -524,10 +524,6 @@
     -fx-font-size: 14.0px;
 }
 
-.jfx-dialog > .content-holder {
-    -fx-background-color: transparent;
-}
-
 .jfx-dialog-layout {
     -fx-background-radius: 4px;
     -fx-padding: 24px 24px 16px 24px;
@@ -1927,4 +1923,4 @@
 
 .line-toggle-button .jfx-toggle-button {
     -fx-padding: 0;
-}
+}