Fix crash when switching between color gradient tabs.

app/src/main/java/org/thoughtcrime/securesms/conversation/colors/ColorizerView.kt

@@ -44,5 +44,6 @@ class ColorizerView @JvmOverloads constructor(
   override fun onDetachedFromWindow() {
     super.onDetachedFromWindow()
     projections.forEach { it.release() }
+    projections = emptyList()
   }
 }

app/src/main/java/org/thoughtcrime/securesms/conversation/colors/ui/ChatColorPreviewView.kt

@@ -107,9 +107,19 @@ class ChatColorPreviewView @JvmOverloads constructor(
     }
   }
 
+  override fun onAttachedToWindow() {
+    super.onAttachedToWindow()
+
+    redrawChatColors()
+  }
+
   override fun onLayout(changed: Boolean, left: Int, top: Int, right: Int, bottom: Int) {
     super.onLayout(changed, left, top, right, bottom)
 
+    redrawChatColors()
+  }
+
+  private fun redrawChatColors() {
     if (chatColors != null) {
       setChatColors(requireNotNull(chatColors))
     }

app/src/main/java/org/thoughtcrime/securesms/conversation/colors/ui/custom/CustomChatColorCreatorPageFragment.kt

@@ -48,6 +48,7 @@ class CustomChatColorCreatorPageFragment :
 
   private lateinit var hueSlider: AppCompatSeekBar
   private lateinit var saturationSlider: AppCompatSeekBar
+  private lateinit var preview: ChatColorPreviewView
 
   override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
     val args: CustomChatColorCreatorFragmentArgs = CustomChatColorCreatorFragmentArgs.fromBundle(requireArguments())
@@ -59,7 +60,8 @@ class CustomChatColorCreatorPageFragment :
       factory
     )[CustomChatColorCreatorViewModel::class.java]
 
-    val preview: ChatColorPreviewView = view.findViewById(R.id.chat_color_preview)
+    preview = view.findViewById(R.id.chat_color_preview)
+
     val hueThumb = ThumbDrawable(requireContext())
     val saturationThumb = ThumbDrawable(requireContext())