Fix startup issues

- MakeDist now copies CommonWPF.dll.
- Spent a bunch of time tracking down a null-pointer deref that only
  happened when you didn't start with a config file.  Fixed.
- The NPE was causing the program to exit without any sort of useful
  diagnostic, so I added an uncaught exception handler that writes
  the crash to a text file in the current directory.
- Added a trace listener definition to App.config that writes log
  messages to a file, but it can't generally be enabled at runtime
  because you can't write files from inside the sandbox.  So it's
  there but commented out.
- Made the initial size of the main window a little wider.

CommonUtil/Misc.cs

@@ -14,6 +14,8 @@
  * limitations under the License.
  */
 using System;
+using System.Diagnostics;
+using System.IO;
 using System.Linq;
 
 namespace CommonUtil {
@@ -28,5 +30,39 @@ namespace CommonUtil {
                 Console.WriteLine("  " + ns);
             }
         }
+
+        /// <summary>
+        /// Writes an unhandled exception trace to a crash file.
+        /// </summary>
+        /// <remarks>
+        /// Usage:
+        ///   AppDomain.CurrentDomain.UnhandledException +=
+        ///       new UnhandledExceptionEventHandler(CommonUtil.Misc.CrashReporter);
+        ///
+        /// Thanks: https://stackoverflow.com/a/21308327/294248
+        /// </remarks>
+        public static void CrashReporter(object sender, UnhandledExceptionEventArgs e) {
+            const string CRASH_PATH = @"CrashLog.txt";
+
+            Exception ex = (Exception)e.ExceptionObject;
+            Debug.WriteLine("CRASHING (term=" + e.IsTerminating + "): " + ex);
+
+            try {
+                using (StreamWriter writer = new StreamWriter(CRASH_PATH, true)) {
+                    writer.WriteLine("*** " + DateTime.Now.ToLocalTime() + " ***");
+                    while (ex != null) {
+                        writer.WriteLine(ex.GetType().FullName + ": " + ex.Message);
+                        writer.WriteLine("Trace:");
+                        writer.WriteLine(ex.StackTrace);
+                        writer.WriteLine(string.Empty);
+
+                        ex = ex.InnerException;
+                    }
+                }
+            } catch {
+                // damn it
+                Debug.WriteLine("Crashed while crashing");
+            }
+        }
     }
 }

MakeDist/FileCopier.cs

@@ -62,8 +62,10 @@ namespace MakeDist {
                 SourceFileSpec.List, false, new string[] { "Asm65.dll" }),
             new CopySpec("CommonUtil/bin/{BUILD_TYPE}/netstandard2.0/", ".",
                 SourceFileSpec.List, false, new string[] { "CommonUtil.dll" }),
-            new CopySpec("CommonWinForms/bin/{BUILD_TYPE}/", ".",
+            //new CopySpec("CommonWinForms/bin/{BUILD_TYPE}/", ".",
-                SourceFileSpec.List, false, new string[] { "CommonWinForms.dll" }),
+            //    SourceFileSpec.List, false, new string[] { "CommonWinForms.dll" }),
+            new CopySpec("CommonWPF/bin/{BUILD_TYPE}/", ".",
+                SourceFileSpec.List, false, new string[] { "CommonWPF.dll" }),
             new CopySpec("PluginCommon/bin/{BUILD_TYPE}/netstandard2.0/", ".",
                 SourceFileSpec.List, false, new string[] { "PluginCommon.dll" }),
             new CopySpec("SourceGen/bin/{BUILD_TYPE}/", ".",

SourceGen/App.config

@@ -3,4 +3,16 @@
     <startup> 
         <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.6.2" />
     </startup>
+
+  <!-- https://docs.microsoft.com/en-us/dotnet/framework/debug-trace-profile/how-to-create-and-initialize-trace-listeners -->
+  <!-- WARNING: this will clash with the security sandbox -->
+  <!--<system.diagnostics>
+    <trace autoflush="true" indentsize="4">
+      <listeners>
+        <add name="myListener"
+             type="System.Diagnostics.TextWriterTraceListener"
+             initializeData="TextWriterOutput.log" />
+      </listeners>
+    </trace>
+  </system.diagnostics>-->
 </configuration>

SourceGen/RuntimeData/Help/tutorials.html

@@ -27,8 +27,8 @@ manual is recommended.</p>
 <h2><a name="basic-features">Tutorial #1: Basic Features</a></h2>
 
 <p>Start by launching SourceGen.  The initial screen has a large
-center area with some links, and some mostly-empty windows on the sides.
+center area with some buttons, and some mostly-empty windows on the sides.
-The links are shortcuts for menu items in the File menu.</p>
+The buttons are shortcuts for menu items in the File menu.</p>
 
 
 <h3>Create the project</h3>

SourceGen/WpfGui/MainWindow.xaml

@@ -23,7 +23,7 @@ limitations under the License.
         mc:Ignorable="d"
         Title="6502bench SourceGen"
         Icon="/SourceGen;component/Res/SourceGenIcon.ico"
-        Width="1000" Height="700" MinWidth="800" MinHeight="500"
+        Width="1200" Height="700" MinWidth="800" MinHeight="500"
         SourceInitialized="Window_SourceInitialized"
         Loaded="Window_Loaded"
         LocationChanged="Window_LocationChanged"

SourceGen/WpfGui/MainWindow.xaml.cs

@@ -159,8 +159,12 @@ namespace SourceGen.WpfGui {
 
 
         public MainWindow() {
+            Debug.WriteLine("START at " + DateTime.Now.ToLocalTime());
             InitializeComponent();
 
+            AppDomain.CurrentDomain.UnhandledException +=
+                new UnhandledExceptionEventHandler(CommonUtil.Misc.CrashReporter);
+
             listViewSetSelectedItems = codeListView.GetType().GetMethod("SetSelectedItems",
                 BindingFlags.NonPublic | BindingFlags.Instance);
             Debug.Assert(listViewSetSelectedItems != null);

SourceGen/WpfGui/NewProject.xaml.cs

@@ -57,8 +57,10 @@ namespace SourceGen.WpfGui {
                 "[nothing!selected]");
 
             TreeViewItem selItem = PopulateNodes(prevSelSystem);
+            if (selItem != null) {
                 selItem.IsSelected = true;
                 selItem.BringIntoView();
+            }
 
             targetSystemTree.Focus();
 
@@ -70,7 +72,8 @@ namespace SourceGen.WpfGui {
         /// </summary>
         /// <param name="tv">TreeView to add items to</param>
         /// <param name="prevSelSystem">Name of previously-selected system.</param>
-        /// <returns>The node that matches prevSelSystem, or null if not found.</returns>
+        /// <returns>The node that matches prevSelSystem, or the first leaf node if no node
+        ///   matches, or null if no leaf nodes are found.</returns>
         private TreeViewItem PopulateNodes(string prevSelSystem) {
             TreeViewItem selItem = null;
 
@@ -105,7 +108,7 @@ namespace SourceGen.WpfGui {
                 newItem.Tag = sd;
                 groupItem.Items.Add(newItem);
 
-                if (isValid && sd.Name == prevSelSystem) {
+                if ((isValid && sd.Name == prevSelSystem) || selItem == null) {
                     selItem = newItem;
                 }
             }