corrected insert when current line is already set as new

the modified line is new status needed to be saved before the new
modified line is new status is set, then when checking if the lines
modified and inserted need to be adjusted because the current line
status will be set to is new, it also needs to check if this before
is new status is not set

also added an indicator in the line number widget when the current
line is modified ('*') or line modified is new ('+')