searchfilters: fixup 4th dialog to draw a separator line between FilterGroup without a label

app/src/main/java/org/schabi/newpipe/fragments/list/search/filter/BaseSearchFilterUiDialogGenerator.java

@@ -42,9 +42,17 @@ public abstract class BaseSearchFilterUiDialogGenerator extends BaseSearchFilter
         return new BaseCreateSearchFilterUI.CreateSortFilterUI(this, context, logic);
     }
 
+    /**
+     * Create a View that acts as a separator between two other {@link View}-Elements.
+     *
+     * @param layoutParams this layout will be modified to have the height of 1 -> to have a
+     *                     the actual separator line.
+     * @return the created {@link SeparatorLineView}
+     */
     @NonNull
-    protected View createSeparatorLine(@NonNull final ViewGroup.LayoutParams layoutParams) {
+    protected SeparatorLineView createSeparatorLine(
-        final View separatorLine = new View(context);
+            @NonNull final ViewGroup.LayoutParams layoutParams) {
+        final SeparatorLineView separatorLine = new SeparatorLineView(context);
         separatorLine.setBackgroundColor(getSeparatorLineColorFromTheme());
         layoutParams.height = 1; // always set the separator to the height of 1
         separatorLine.setLayoutParams(layoutParams);
@@ -60,4 +68,17 @@ public abstract class BaseSearchFilterUiDialogGenerator extends BaseSearchFilter
         title.setLayoutParams(layoutParams);
         return title;
     }
+
+    /**
+     * A special view to separate two other {@link View}s.
+     * <p>
+     * class only needed to distinct this special view from other View based views.
+     * (eg. instanceof)
+     */
+    protected static final class SeparatorLineView extends View {
+
+        private SeparatorLineView(@NonNull final Context context) {
+            super(context);
+        }
+    }
 }

app/src/main/java/org/schabi/newpipe/fragments/list/search/filter/SearchFilterChipDialogGenerator.java

@@ -3,6 +3,7 @@
 package org.schabi.newpipe.fragments.list.search.filter;
 
 import android.content.Context;
+import android.view.View;
 import android.view.ViewGroup;
 import android.widget.GridLayout;
 import android.widget.TextView;
@@ -37,6 +38,10 @@ public class SearchFilterChipDialogGenerator extends SearchFilterDialogGenerator
             final TextView filterLabel = createFilterLabel(filterGroup, layoutParams);
             globalLayout.addView(filterLabel);
             viewsWrapper.add(filterLabel);
+        } else if (doWeNeedASeparatorView()) {
+            final SeparatorLineView separatorLineView = createSeparatorLine();
+            globalLayout.addView(separatorLineView);
+            viewsWrapper.add(separatorLineView);
         }
 
         final ChipGroup chipGroup = new ChipGroup(context);
@@ -55,6 +60,15 @@ public class SearchFilterChipDialogGenerator extends SearchFilterDialogGenerator
         viewsWrapper.add(chipGroup);
     }
 
+    private boolean doWeNeedASeparatorView() {
+        // if 0 than there is nothing to separate
+        if (globalLayout.getChildCount() == 0) {
+            return false;
+        }
+        final View lastView = globalLayout.getChildAt(globalLayout.getChildCount() - 1);
+        return !(lastView instanceof SeparatorLineView);
+    }
+
     private ViewGroup.MarginLayoutParams setDefaultMarginInDp(
             @NonNull final ViewGroup.MarginLayoutParams layoutParams,
             final int left, final int top, final int right, final int bottom) {

app/src/main/java/org/schabi/newpipe/fragments/list/search/filter/SearchFilterDialogGenerator.java

@@ -239,7 +239,7 @@ public class SearchFilterDialogGenerator extends BaseSearchFilterUiDialogGenerat
     }
 
     @NonNull
-    private View createSeparatorLine() {
+    protected SeparatorLineView createSeparatorLine() {
         return createSeparatorLine(clipFreeRightColumnLayoutParams(true));
     }