Prevent popup menu from covering bottom items in the media overview screen.

app/src/main/java/org/thoughtcrime/securesms/util/BottomOffsetDecoration.kt

@@ -0,0 +1,22 @@
+package org.thoughtcrime.securesms.util
+
+import android.graphics.Rect
+import android.view.View
+import androidx.annotation.Px
+import androidx.recyclerview.widget.RecyclerView
+
+/**
+ * Adds some empty space to the bottom of a recyclerview. Useful if you need some "dead space" at the bottom of the list to account for floating menus that may
+ * otherwise cover up the bottom entries of the list.
+ */
+class BottomOffsetDecoration(@Px private val bottomOffset: Int) : RecyclerView.ItemDecoration() {
+
+  override fun getItemOffsets(outRect: Rect, view: View, parent: RecyclerView, state: RecyclerView.State) {
+    super.getItemOffsets(outRect, view, parent, state)
+    if (parent.getChildAdapterPosition(view) == state.itemCount - 1) {
+      outRect.set(0, 0, 0, bottomOffset)
+    } else {
+      outRect.set(0, 0, 0, 0)
+    }
+  }
+}