Update comments, remove unused var

SourceGen/MainController.cs

@@ -1643,6 +1643,9 @@ namespace SourceGen {
                 // the undo operation.
                 Debug.WriteLine("EditAddress: not allowed to remove address at offset +000000");
             } else if (true || attr.Address != dlg.Address) {
+                // NOTE: we used to prevent creation of an apparently redundant address change,
+                // but it's really helpful to put one on code that isn't moving before you
+                // start moving other stuff around.
                 Debug.WriteLine("EditAddress: changing addr at offset +" + offset.ToString("x6") +
                     " to " + dlg.Address);
 

SourceGen/PlatformSymbols.cs

@@ -38,7 +38,7 @@ namespace SourceGen {
         /// Alphanumeric ASCII + underscore for label, which must start at beginning of line.
         /// Value is somewhat arbitrary, but ends if we see a comment delimiter (semicolon) or
         /// whitespace.  Spaces are allowed between tokens, but not required.  Value, width,
-        /// and mask may be hex, decimal, or binary.
+        /// and mask may be hex, decimal, or binary; these are simply tokenized by regex.
         ///
         /// Looks like:
         ///   NAME {@,=,<,>} VALUE [& MASK] [WIDTH] [;COMMENT]

SourceGen/WpfGui/EditDefSymbol.xaml.cs

@@ -190,7 +190,7 @@ namespace SourceGen.WpfGui {
 
             Label = Value = VarWidth = Comment = string.Empty;
 
-            int maxWidth, maxAddr;
+            int maxWidth;
             if (isVariable) {
                 ConstantLabel = (string)FindResource("str_VariableConstant");
                 maxWidth = 256;