Add basic TOTP support with mocked creation.

core/ui/src/main/java/org/signal/core/ui/compose/ComposeFragment.kt

@@ -5,6 +5,7 @@
 
 package org.signal.core.ui.compose
 
+import android.os.Build
 import android.os.Bundle
 import android.view.LayoutInflater
 import android.view.View
@@ -18,10 +19,28 @@ import org.signal.core.ui.logging.LoggingFragment
  * Generic ComposeFragment which can be subclassed to build UI with compose.
  */
 abstract class ComposeFragment : LoggingFragment() {
-  override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? = content {
-    SignalTheme {
-      FragmentContent()
+
+  /**
+   * Whether the platform may offer to fill or save what the user types here.
+   *
+   * Compose registers its text fields with the autofill framework, so a password manager will offer to save the
+   * contents of any screen with a field on it. Override to false where that offer is wrong -- a one-time code or the
+   * name of a device is not a credential, and being asked to save it every time is noise the user can't turn off.
+   */
+  open val autofillEnabled: Boolean = true
+
+  override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
+    val view = content {
+      SignalTheme {
+        FragmentContent()
+      }
     }
+
+    if (!autofillEnabled && Build.VERSION.SDK_INT >= 26) {
+      view.importantForAutofill = View.IMPORTANT_FOR_AUTOFILL_NO_EXCLUDE_DESCENDANTS
+    }
+
+    return view
   }
 
   @Composable