4 TextBuffer questions

[Benoît Touron <b touron citb bull net>]

Hi !

I am using a TextView/TextBuffer to display text with color.
How can I copy a substring of my TextBuffer into another TextBuffer, 
keeping the original colors ?
The result of the get_text method does not seem to contain informations 
about the tags.
Another question: How can I add an antry to the default context menu of 
the TextView (cut/paste/...). I need to add specific actions when the 
user right-clicks in the TextView.
Third : how can I add a bar on the left side of a TextView, to display 
additionnal informations (like bookmarks) ?
Last (but not least) : How can I highlight the current line ? I could 
apply a tag with the background color set to yellow, but only the 
characters would be highlighted. The background behind the text would 
remain white, which would not look very nice.
Thanks
Ben