Initial Program Model Complete

There were some minor problems with the Save As action causing it to not work as desired, namely the file name was incorrectly defaulting to "." and the directory of the file saved was not being remembered.  The default file name was set to "." in the attempt to use the current directory, but the get save file name dialog saw this as the file name with no directory and used the directory the program was started in.  The string "./" should have been used.

The way it should be working is that the file name should start with the current file name giving the user the option to replace it or modify it.  If the user doesn't change the file name, the dialog will issue a warning asking if the file should be overwritten.  If the current file is untitled, then the default file name will be set to the current directory, and the dialog will contain a blank file name.  After the file is saved successfully, the current directory (that gets saved in the program settings upon exit) is set to the directory of the saved file.

Now it is time to start hooking up the parser and translator between the edit box and program model.  But first, this is a good point to make a development release.  The release related files were updated for a new release and the repository was given the tag v0.3.3.

[commit 143f449330] [commit f95a3d8d55]

Another Undo Issue

Testing has now been completed and I think most of the possible change scenarios have been tested.  There was some more problems with undo operations when at a new line that was not yet reported as inserted.  For some undo operations, a line was not being reported as changed when it should have been.  This occurred when the line of the beginning of the undo change was more than one line away from the current line that was new.

To correct this problem, a check was added if the line of the beginning of the change is more than one line away from the modified (new) line, then the number of lines modified is set to one from zero and since this is the next line, the changed line number is incremented.

Getting into this situation was rather complex, which required an insert of a new line (Control+Enter) in the middle of a line, moving to the end of this new line, deleting the end of this line to combine it with the next line, and then one undo.  This worked so far, but doing undo again is when the problem occurred.  I'm sure there could be more complex sequences that will not be detected correctly, but it's time to move on.  Any new problems that occur will be dealt with as they appear.

There is also a screen update problem that sometime occurs during an undo where a entire line is not redrawn correctly on the screen.  However, this was proven to be a bug in the QPlainTextEdit base class, not in the EditBox class because a simple program using just the QPlainTextEdit also exhibits the same bug (though the QTextEdit class does not).

[commit 2fc26b865a]