Add editor to horizontal rule span parameters

Author: theck13

aztec/src/main/kotlin/org/wordpress/aztec/formatting/LineBlockFormatter.kt

@@ -127,7 +127,8 @@ class LineBlockFormatter(editor: AztecText) : AztecFormatter(editor) {
         val span = AztecHorizontalRuleSpan(
             editor.context,
             ContextCompat.getDrawable(editor.context, R.drawable.img_hr),
-            nestingLevel
+            nestingLevel,
+            editor
         )
 
         val builder = SpannableStringBuilder(Constants.MAGIC_STRING)

aztec/src/main/kotlin/org/wordpress/aztec/spans/AztecHorizontalRuleSpan.kt

@@ -3,10 +3,15 @@ package org.wordpress.aztec.spans
 import android.content.Context
 import android.graphics.drawable.Drawable
 import org.wordpress.aztec.AztecAttributes
+import org.wordpress.aztec.AztecText
 
 class AztecHorizontalRuleSpan(context: Context, drawable: Drawable, override var nestingLevel: Int,
-                              override var attributes: AztecAttributes = AztecAttributes()) :
+                              editor: AztecText? = null, override var attributes: AztecAttributes = AztecAttributes()) :
         AztecDynamicImageSpan(context, drawable), AztecFullWidthImageSpan, AztecSpan {
 
+    init {
+        textView = editor
+    }
+
     override val TAG: String = "hr"
-}
+}