Fix 'prevent-element-src-loading' — broken website

[AdamWr]

• Fix issue with broken websites (I think that's the most important and I guess that other issues could be fixed later)

Related issue - AdguardTeam/AdguardFilters#136501

It looks like that scriptlet doesn't work correctly and it breaks website.

Screenshot

Uncaught TypeError: thisArg.getAttribute is not a function

As far as I understand, the problem is in this line:

Scriptlets/src/scriptlets/prevent-element-src-loading.js

Line 173 in 202f6d8

const isMatched = thisArg.getAttribute(source.name) === 'matched'

thisArg sometimes doesn't have getAttribute method and it throws error.
So, I guess that checking if getAttribute is a function, for example, by something like this:

thisArg.getAttribute?.(source.name)

should fixes this issue.

By the way, it looks like that this issue - #228 is not fixed or I'm doing something wrong.
I have checked it here - https://jsfiddle.net/ofzmtek3/

---

Additional notes.
It seems that it happens only with latest nightly build for Windows (7.12 nightly 1 (build 4121, CL 1.10.154)), because (if I'm not wrong) other versions do not use latest scriptlets library yet.

[AdamWr]

moned to #276

[AdamWr]

If I understand correctly issue with incorrect blocking has been fixed.
It's nice, but if I'm not wrong other issues are not fixed and I guess this issue was closed by bot automatically, so I'm reopening it.
Please close it if all those issues are already fixed and I was wrong.

[slavaleleka]

yes, only incorrect blocking is fixed. the issue should be opened due to other tasks. so better to create separate issues for different problems in future