check validity of fields

apps/multiplatform/common/src/commonMain/kotlin/chat/simplex/common/views/usersettings/NetworkAndServers.kt

@@ -288,7 +288,9 @@ fun SocksProxySettings(
         networkProxySaved.auth == proxyAuthModeUnsaved.value &&
         onionHosts.value == onionHostsSaved.value
     ) ||
-      remember { derivedStateOf { !validPort(portUnsaved.value.text) } }.value
+        !validCredential(usernameUnsaved.value.text) ||
+        !validCredential(passwordUnsaved.value.text) ||
+        !validPort(portUnsaved.value.text)
   val resetDisabled = hostUnsaved.value.text.trim() == "localhost" && portUnsaved.value.text.trim() == "9050" && proxyAuthRandomUnsaved.value && onionHosts.value == NetCfg.defaults.onionHosts
   ModalView(
     close = {
@@ -348,7 +350,7 @@ fun SocksProxySettings(
               usernameUnsaved,
               stringResource(MR.strings.network_proxy_username),
               modifier = Modifier.fillMaxWidth(),
-              isValid = { !it.contains(':') && !it.contains('@') },
+              isValid = ::validCredential,
               keyboardActions = KeyboardActions(onNext = { defaultKeyboardAction(ImeAction.Next) }),
               keyboardType = KeyboardType.Text,
             )
@@ -356,7 +358,7 @@ fun SocksProxySettings(
               passwordUnsaved,
               stringResource(MR.strings.network_proxy_password),
               modifier = Modifier.fillMaxWidth(),
-              isValid = { !it.contains(':') && !it.contains('@') },
+              isValid = ::validCredential,
               keyboardActions = KeyboardActions(onNext = { defaultKeyboardAction(ImeAction.Next) }),
               keyboardType = KeyboardType.Password,
             )
@@ -487,6 +489,9 @@ fun validPort(s: String): Boolean {
   return s.isNotBlank() && s.matches(validPort)
 }
 
+private fun validCredential(s: String): Boolean =
+  !s.contains(':') && !s.contains('@')
+
 fun showWrongProxyConfigAlert() {
   AlertManager.shared.showAlertMsg(
     title = generalGetString(MR.strings.network_proxy_incorrect_config_title),