Revert "Simplification"

This reverts commit 12f39e537a.

app/src/main/java/eu/faircode/email/BehaviorBottomMargin.java

@@ -0,0 +1,67 @@
+package eu.faircode.email;
+
+/*
+    This file is part of FairEmail.
+
+    FairEmail is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    FairEmail is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with FairEmail.  If not, see <http://www.gnu.org/licenses/>.
+
+    Copyright 2018-2020 by Marcel Bokhorst (M66B)
+*/
+
+import android.content.Context;
+import android.util.AttributeSet;
+import android.view.View;
+
+import androidx.annotation.NonNull;
+import androidx.coordinatorlayout.widget.CoordinatorLayout;
+
+import com.google.android.material.snackbar.Snackbar;
+
+public class BehaviorBottomMargin extends CoordinatorLayout.Behavior<View> {
+    public BehaviorBottomMargin() {
+        super();
+    }
+
+    public BehaviorBottomMargin(Context context, AttributeSet attrs) {
+        super(context, attrs);
+    }
+
+    @Override
+    public boolean layoutDependsOn(@NonNull CoordinatorLayout parent, @NonNull View child, @NonNull View dependency) {
+        return (dependency instanceof Snackbar.SnackbarLayout);
+    }
+
+    @Override
+    public boolean onLayoutChild(@NonNull CoordinatorLayout parent, @NonNull View child, int layoutDirection) {
+        setMargin(child, 0);
+        return super.onLayoutChild(parent, child, layoutDirection);
+    }
+
+    @Override
+    public boolean onDependentViewChanged(@NonNull CoordinatorLayout parent, @NonNull View child, @NonNull View dependency) {
+        setMargin(child, dependency.getHeight());
+        return true;
+    }
+
+    @Override
+    public void onDependentViewRemoved(CoordinatorLayout parent, View child, View dependency) {
+        setMargin(child, 0);
+    }
+
+    private static void setMargin(View child, int value) {
+        CoordinatorLayout.LayoutParams lparam = (CoordinatorLayout.LayoutParams) child.getLayoutParams();
+        lparam.setMargins(0, 0, 0, value);
+        child.setLayoutParams(lparam);
+    }
+}

app/src/main/res/layout/fragment_messages.xml

@@ -10,7 +10,7 @@
         android:id="@+id/swipeRefresh"
         android:layout_width="match_parent"
         android:layout_height="match_parent"
-        app:layout_behavior="eu.faircode.email.BehaviorBottomPadding">
+        app:layout_behavior="eu.faircode.email.BehaviorBottomMargin">
 
         <androidx.constraintlayout.widget.ConstraintLayout
             android:layout_width="match_parent"