Add uninstall method to EndOfBufferMarkerAdder

Author: Gerardo

aztec/src/main/kotlin/org/wordpress/aztec/AztecText.kt

@@ -310,6 +310,7 @@ open class AztecText : AppCompatEditText, TextWatcher, UnknownHtmlSpan.OnUnknown
 
     var observationQueue: ObservationQueue = ObservationQueue(this)
     var textWatcherEventBuilder: TextWatcherEvent.Builder = TextWatcherEvent.Builder()
+    var endOfBufferMarkerAdderWatcher: EndOfBufferMarkerAdder? = null
 
     private var accessibilityDelegate = AztecTextAccessibilityDelegate(this)
 
@@ -640,6 +641,10 @@ open class AztecText : AppCompatEditText, TextWatcher, UnknownHtmlSpan.OnUnknown
         }
     }
 
+    fun removeEndOfBufferMarkerAdder() {
+        endOfBufferMarkerAdderWatcher?.uninstallEndOfBuffer(this)
+    }
+
     private fun <T> selectionHasExactlyOneMarker(start: Int, end: Int, type: Class<T>): Boolean {
         val spanFound: Array<T> = editableText.getSpans(
                 start,
@@ -891,7 +896,7 @@ open class AztecText : AppCompatEditText, TextWatcher, UnknownHtmlSpan.OnUnknown
 
         FullWidthImageElementWatcher.install(this)
 
-        EndOfBufferMarkerAdder.install(this)
+        endOfBufferMarkerAdderWatcher = EndOfBufferMarkerAdder.install(this)
         ZeroIndexContentWatcher.install(this)
 
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N_MR1) {

aztec/src/main/kotlin/org/wordpress/aztec/watchers/EndOfBufferMarkerAdder.kt

@@ -18,8 +18,7 @@ class EndOfBufferMarkerAdder(text: Editable) : TextWatcher {
     override fun beforeTextChanged(s: CharSequence, start: Int, count: Int, after: Int) {}
 
     override fun onTextChanged(s: CharSequence, start: Int, before: Int, count: Int) {
-        // count < before to take into account auto-corrected words
-        deletedText = before > 0 && count < before
+        deletedText = before > 0
     }
 
     override fun afterTextChanged(text: Editable) {
@@ -32,9 +31,26 @@ class EndOfBufferMarkerAdder(text: Editable) : TextWatcher {
         // by the way, the cursor will be adjusted "automatically" by RichTextEditText's onSelectionChanged to before the marker
     }
 
+    fun uninstallEndOfBuffer(aztecText: AztecText) {
+        uninstall(aztecText)
+    }
+
     companion object {
-        fun install(editText: AztecText) {
-            editText.addTextChangedListener(EndOfBufferMarkerAdder(editText.text))
+        private val watchers = mutableMapOf<AztecText, EndOfBufferMarkerAdder>()
+
+        fun install(editText: AztecText): EndOfBufferMarkerAdder {
+            var watcher = EndOfBufferMarkerAdder(editText.text)
+            editText.addTextChangedListener(watcher)
+            watchers[editText] = watcher
+            return watcher
+        }
+
+        fun uninstall(editText: AztecText) {
+            val watcher = watchers[editText]
+            if (watcher != null) {
+                editText.removeTextChangedListener(watcher)
+                watchers.remove(editText)
+            }
         }
 
         fun ensureEndOfTextMarker(text: Editable, deletedText: Boolean = false): Editable {
@@ -45,9 +61,7 @@ class EndOfBufferMarkerAdder(text: Editable) : TextWatcher {
             if (text.isEmpty()) {
                 if (text.getSpans(0, 0, IAztecBlockSpan::class.java).isNotEmpty()) {
                     // need to add a end-of-text marker so a block element can render in the empty text.
-                    if (!deletedText) {
-                        text.append(Constants.END_OF_BUFFER_MARKER)
-                    }
+                    text.append(Constants.END_OF_BUFFER_MARKER)
                 }
                 return text
             } else if (text.length == 1 && text[0] == Constants.END_OF_BUFFER_MARKER && deletedText) {