Added some predefined constants and moved the editor insode a larger window
Added a small display for the pen tool (simple dot)
Refactor and cleanup of editor
Prevent erase when cursor at beginning
Use text.isEmpty() instead of checking for "" or length() == 0
Allow monving the cursor with arrow keys
Allow insert of key at cursor point
Cleanup and cosmetic changes
Bug fix in the computation of the row number according to absolute index.
Choice of tool (pen / text)
Added drop-down menu to choose font
Added simple toggle for LTR/RTL