Merge bitcoin-core/gui#690: Catch invalid networks combination crash

f4a11d7 gui: bugfix, catch invalid networks combination crash (furszy)

Pull request description:

  The app currently crashes if a network is set inside bitcoin.conf and
  another one is provided as param.
  The reason is an uncaught runtime_error.

ACKs for top commit:
  jarolrod:
    tACK f4a11d7
  johnny9:
    tACK f4a11d7
  john-moffett:
    ACK f4a11d7
  pablomartin4btc:
    Tested ACK f4a11d7.
  hebasto:
    ACK f4a11d7, tested on Ubuntu 22.04 (Qt 5.15.3).

Tree-SHA512: fc5e26ae0a361e37d53d904cc122d07f064f261b309629c6386cb046ab1b3d2c805cbfe0db8ed3e934af52c6cf0ebb0bef9df9117b4330d9b0ea40c76f9270f9

Author: hebasto

src/qt/bitcoin.cpp

@@ -592,29 +592,30 @@ int GuiMain(int argc, char* argv[])
     // Gracefully exit if the user cancels
     if (!Intro::showIfNeeded(did_show_intro, prune_MiB)) return EXIT_SUCCESS;
 
-    /// 6. Determine availability of data directory and parse bitcoin.conf
-    /// - Do not call gArgs.GetDataDirNet() before this step finishes
+    /// 6a. Determine availability of data directory
     if (!CheckDataDirOption()) {
         InitError(strprintf(Untranslated("Specified data directory \"%s\" does not exist.\n"), gArgs.GetArg("-datadir", "")));
         QMessageBox::critical(nullptr, PACKAGE_NAME,
             QObject::tr("Error: Specified data directory \"%1\" does not exist.").arg(QString::fromStdString(gArgs.GetArg("-datadir", ""))));
         return EXIT_FAILURE;
     }
-    if (!gArgs.ReadConfigFiles(error, true)) {
-        InitError(strprintf(Untranslated("Error reading configuration file: %s\n"), error));
-        QMessageBox::critical(nullptr, PACKAGE_NAME,
-            QObject::tr("Error: Cannot parse configuration file: %1.").arg(QString::fromStdString(error)));
-        return EXIT_FAILURE;
-    }
+    try {
+        /// 6b. Parse bitcoin.conf
+        /// - Do not call gArgs.GetDataDirNet() before this step finishes
+        if (!gArgs.ReadConfigFiles(error, true)) {
+            InitError(strprintf(Untranslated("Error reading configuration file: %s\n"), error));
+            QMessageBox::critical(nullptr, PACKAGE_NAME,
+                QObject::tr("Error: Cannot parse configuration file: %1.").arg(QString::fromStdString(error)));
+            return EXIT_FAILURE;
+        }
 
-    /// 7. Determine network (and switch to network specific options)
-    // - Do not call Params() before this step
-    // - Do this after parsing the configuration file, as the network can be switched there
-    // - QSettings() will use the new application name after this, resulting in network-specific settings
-    // - Needs to be done before createOptionsModel
+        /// 7. Determine network (and switch to network specific options)
+        // - Do not call Params() before this step
+        // - Do this after parsing the configuration file, as the network can be switched there
+        // - QSettings() will use the new application name after this, resulting in network-specific settings
+        // - Needs to be done before createOptionsModel
 
-    // Check for chain settings (Params() calls are only valid after this clause)
-    try {
+        // Check for chain settings (Params() calls are only valid after this clause)
         SelectParams(gArgs.GetChainName());
     } catch(std::exception &e) {
         InitError(Untranslated(strprintf("%s\n", e.what())));