Fix scroll to bottom button always visible if last item is taller than RecyclerView

libsession/src/main/java/org/session/libsession/utilities/ViewUtils.kt

@@ -4,6 +4,7 @@ import android.content.Context
 import android.util.TypedValue
 import androidx.annotation.AttrRes
 import androidx.annotation.ColorInt
+import androidx.recyclerview.widget.RecyclerView
 
 @ColorInt
 fun Context.getColorFromAttr(
@@ -13,4 +14,10 @@ fun Context.getColorFromAttr(
 ): Int {
     theme.resolveAttribute(attrColor, typedValue, resolveRefs)
     return typedValue.data
-}
+}
+
+val RecyclerView.isScrolledToBottom: Boolean
+    get() {
+        val contentHeight = height - (paddingTop + paddingBottom)
+        return computeVerticalScrollRange() == computeVerticalScrollOffset() + contentHeight
+    }