Remove content description of mic button if it is not visible.

vector/src/main/java/im/vector/app/features/home/room/detail/composer/VoiceMessageRecorderView.kt

@@ -20,6 +20,7 @@ import android.content.Context
 import android.text.format.DateUtils
 import android.util.AttributeSet
 import android.view.MotionEvent
+import android.view.View
 import androidx.constraintlayout.widget.ConstraintLayout
 import androidx.core.view.isInvisible
 import androidx.core.view.isVisible
@@ -87,6 +88,15 @@ class VoiceMessageRecorderView @JvmOverloads constructor(
         initListeners()
     }
 
+    override fun onVisibilityChanged(changedView: View, visibility: Int) {
+        super.onVisibilityChanged(changedView, visibility)
+        if (changedView == this && visibility == VISIBLE) {
+            views.voiceMessageMicButton.contentDescription = context.getString(R.string.a11y_start_voice_message)
+        } else {
+            views.voiceMessageMicButton.contentDescription = ""
+        }
+    }
+
     fun initVoiceRecordingViews() {
         recordingState = RecordingState.NONE