Make the copying of changelog lines less brittle

[pabs3]

Stop copying changelog lines when a changelog header containing the exact
version is seen. Until now, random other versions that happened to contain
the installed version did this. Also, any non-header lines that happened to
mention the installed version also did this.

This isn't the most correct fix though, the right way to do this would be
to reimplement the code using proper changelog parsing from the Python
debian module.

[rickysarraf]

Can you please rebase this PR ?

[rickysarraf]

Stop copying changelog lines when a changelog header containing the exact
version is seen. Until now, random other versions that happened to contain
the installed version did this. Also, any non-header lines that happened to
mention the installed version also did this.

This isn't the most correct fix though, the right way to do this would be
to reimplement the code using proper changelog parsing from the Python
debian module.

Which python debian module are you referring to hear ?

[rickysarraf]

Which python debian module are you referring to hear ?

But given that changelog functionality depends on the availability of python-apt, this is Linux only. No cross-platform support required.

[pabs3]

I was referring to the module you get when you 'import debian', which is provided by the python3-debian package within Debian.

…

-- bye, pabs https://wiki.debian.org/PaulWise

[rickysarraf]

I was referring to the module you get when you 'import debian', which is provided by the python3-debian package within Debian.
…
-- bye, pabs https://wiki.debian.org/PaulWise

Yes. That looks like a better option.