Perform port selection after initializing packages

Fix #8400

Author: cmaglie

app/src/processing/app/Base.java

@@ -269,6 +269,8 @@ public Base(String[] args) throws Exception {
     splash.splashText(tr("Initializing packages..."));
     BaseNoGui.initPackages();
 
+    parser.getUploadPort().ifPresent(BaseNoGui::selectSerialPort);
+
     splash.splashText(tr("Preparing boards..."));
 
     if (!isCommandLine()) {

arduino-core/src/processing/app/helpers/CommandlineParser.java

@@ -41,6 +41,7 @@ private enum ACTION {
   private String getPref;
   private String boardToInstall;
   private String libraryToInstall;
+  private Optional<String> uploadPort = Optional.empty();
   private final List<String> filenames = new LinkedList<>();
 
   public CommandlineParser(String[] args) {
@@ -141,7 +142,7 @@ public void parseArgumentsPhase1() {
         i++;
         if (i >= args.length)
           BaseNoGui.showError(null, tr("Argument required for --port"), 3);
-        BaseNoGui.selectSerialPort(args[i]);
+        uploadPort = Optional.of(args[i]);
         if (action == ACTION.GUI)
           action = ACTION.NOOP;
         continue;
@@ -356,4 +357,8 @@ public String getLibraryToInstall() {
   public boolean isPreserveTempFiles() {
     return preserveTempFiles;
   }
+
+  public Optional<String> getUploadPort() {
+    return uploadPort;
+  }
 }