Prepopulate find number with local user country code.

app/src/main/java/org/thoughtcrime/securesms/recipients/ui/findby/FindByState.kt

@@ -5,9 +5,15 @@
 
 package org.thoughtcrime.securesms.recipients.ui.findby
 
+import com.google.i18n.phonenumbers.NumberParseException
 import com.google.i18n.phonenumbers.PhoneNumberUtil
+import org.signal.core.util.orNull
+import org.thoughtcrime.securesms.recipients.Recipient
 import org.thoughtcrime.securesms.registration.util.CountryPrefix
 
+/**
+ * State for driving find by number/username screen.
+ */
 data class FindByState(
   val mode: FindByMode,
   val userEntry: String = "",
@@ -17,4 +23,21 @@ data class FindByState(
   val selectedCountryPrefix: CountryPrefix = supportedCountryPrefixes.first(),
   val countryPrefixSearchEntry: String = "",
   val isLookupInProgress: Boolean = false
-)
+) {
+  companion object {
+    fun startingState(self: Recipient, mode: FindByMode): FindByState {
+      val countryCode: Int = try {
+        PhoneNumberUtil.getInstance()
+          .parse(self.e164.orNull(), null)
+          .countryCode
+      } catch (e: NumberParseException) {
+        -1
+      }
+
+      val state = FindByState(mode = mode)
+      return state.copy(
+        selectedCountryPrefix = state.supportedCountryPrefixes.firstOrNull { it.digits == countryCode } ?: state.supportedCountryPrefixes.first()
+      )
+    }
+  }
+}

app/src/main/java/org/thoughtcrime/securesms/recipients/ui/findby/FindByViewModel.kt

@@ -28,9 +28,7 @@ class FindByViewModel(
 ) : ViewModel() {
 
   private val internalState = mutableStateOf(
-    FindByState(
-      mode = mode
-    )
+    FindByState.startingState(self = Recipient.self(), mode = mode)
   )
 
   val state: State<FindByState> = internalState