Error Highlighting – Initial Start Up Fix

The problem with the errors not being highlighted when the program is first loaded was not caused due to the edit box not being drawn yet as first thought.  The problem was identified to be that the text cursor was not valid initially.  When the extra selection list was set up, each enter had an invalid cursor, so nothing was highlighted.  The seemed to be no way to initialize the text cursor in the edit box constructor.

To compensate for this problem, a mechanism was implemented where the updated errors list is saved and not acted upon unless the text cursor is valid.  A new errors list member was added to the edit box class to hold the saved errors list.  The errors list needs to be saved anyway because it will be needed to access the error messages.

A new cursor valid flag was also added to the edit box class, which is initialized to false.  In the cursor moved slot, the text cursor will be valid and this event always occurs during startup.  So in this slot, if the cursor valid flag is not set, it is set to true and then the update errors slot is called to set the extra selections list.

[commit 89cfa532a8]