program: added append operation to program update

new update append operation (in addition to insert, change, and remove)
is similar to insert except adds the line to the end of the program; is
meant to only be used when loading a program from a file (not yet
implemented in the program class); and is triggered by passing a -1 for
the line number to the update function (which the edit box instance will
not do)

the operation enumeration definition (with a new value for the append
operation) was moved from the error list header file to the program
model header file (the error list no longer uses the operation once
the no longer present set change index  function was removed)

errorlist.h

@@ -29,13 +29,6 @@
 #include <QString>
 
 
-enum Operation
-{
-	Insert_Operation,
-	Change_Operation,
-	Remove_Operation
-};
-
 // class for holding details for an error of a program line
 class ErrorItem
 {
@@ -118,9 +111,8 @@ class ErrorList : public QList<ErrorItem>
 	}
 
 private:
-	void setChangeIndex(int index, Operation operation);
-
 	bool m_changed;						// error list changed
 };
 
+
 #endif // ERRORLIST_H

programmodel.cpp

@@ -238,7 +238,7 @@ void ProgramModel::clear(void)
 
 
 // slot function to receive program updates
-
+//   - if lineNumber == 1 then append line to end of program
 void ProgramModel::update(int lineNumber, int linesDeleted, int linesInserted,
 	QStringList lines)
 {
@@ -269,12 +269,21 @@ void ProgramModel::update(int lineNumber, int linesDeleted, int linesInserted,
 	}
 	else if (linesInserted > 0)
 	{
-		// insert new lines into the program
+		Operation operation;
+		if (lineNumber == -1)  // append to end of program?
+		{
+			lineNumber = oldCount;
+			operation = Append_Operation;
+		}
+		else  // insert new lines into the program
+		{
+			operation = Insert_Operation;
+		}
 		int lastLineNumber = lineNumber + linesInserted - 1;
 		beginInsertRows(QModelIndex(), lineNumber, lastLineNumber);
 		while (i < count)
 		{
-			updateLine(Insert_Operation, lineNumber++, lines.at(i++));
+			updateLine(operation, lineNumber++, lines.at(i++));
 		}
 		endInsertRows();
 	}
@@ -341,7 +350,7 @@ bool ProgramModel::updateLine(Operation operation, int lineNumber,
 		delete rpnList;  // no longer needed
 		return changed;
 	}
-	else if (operation == Insert_Operation)
+	else if (operation == Append_Operation || operation == Insert_Operation)
 	{
 		LineInfo lineInfo;
 		lineInfo.errIndex = -1;

programmodel.h

@@ -41,6 +41,15 @@ class Table;
 class Translator;
 
 
+enum Operation
+{
+	Append_Operation,
+	Insert_Operation,
+	Change_Operation,
+	Remove_Operation
+};
+
+
 // class for holding and accessing a program word
 class ProgramWord
 {