[Qt-interest] Signal emitted while scrolling in QTextEdit

[Keshava Krishna]

Hi,

'm building a text editor using QTextEdit, the user can scroll through the
text document by using vertical scrollbar.
i want a signal to be emitted whenever the document is scrolled through
(even though the cursor position is not changed),
also it would be helpful if i get to know the offsets (character count) of
the 1st and the last character that is currently visible in the Text Area.
Please suggest me a way to do it.

Regards,
Keshava.
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