getTitle breaks website

[nzyeehaa]

J4.1.4
I just had an obscure case, which may be hard for others to reproduce.(or not as i later found out)

I have a com_content article override, which simply adds a div with some details, when the view=article and the menu=abc - and also if a user is logged in it adds a button.
There is some javascript in the template which adds information into the above div under correct circumstances.
Its all fairly simple and works fine...

Until... the title of the article has " in it (ie: 12" disc)
Then the added code snippet stops working!

the javascript used " in its code, (ie: var cc = "...)
all the actual " were escaped (i.e: <a href=\"mailto:...)
it used the article title in the javascript, which was included by $title = $doc->getTitle();
this title 12" disc was unescaped and broke the javascipt.

After it was broken, I changed all javascript to use ' instead of " (both are correct) and the problem disappears. (javascript self healing)

I figured the article titles would all be escaped correctly since we are a long way down the information chain but that is where I was wrong.

I still needed to make 1 crucial change from...
$title = $doc->getTitle();
to
$title = htmlspecialchars($doc->getTitle(), ENT_QUOTES, 'UTF-8');

[nzyeehaa]

change
$title = $doc->getTitle();
to
$title = htmlspecialchars($doc->getTitle(), ENT_QUOTES, 'UTF-8');