Not all spaces removed from a back-quoted block

[robertjank]

In projects Frustration and Getting started with Sonic Pi for language ar-SA (Arabic) there are cases where a space following the first back-quote of a pair of back-quotes is not removed. It is unclear whether this is caused by the special character set used for Arabic and the fact that this language is read from right to left.

[wheleph]

@robertjank can you specify the place where you observe this behaviour?

[robertjank]

An example is project Frustration, language ar-SA, file step_2.md, line 7. This line contains 4 back-quotes.
In the input (l10n_master branch), the first and third back-quote are followed by a space and the second and fourth are preceded by a space.
NTTT removes the space after the first and third back-quote, but not the spaces before the second and fourth one.
Similar things happen on lines 19, 25 and 29 of this file.

In step_4.md, line 5, the space after the third back-quote is also not removed (next to the second and fourth back-quote).

[torarve]

Seems like this is already fixed. Artifact seen on line 7 here is missing after running current code locally:

+ احذف الكتل ` إلى الأبد` و ` عند بدء` بسحبها إلى اللوحة:

becomes

+ احذف الكتل `إلى الأبد` و `عند بدء` بسحبها إلى اللوحة:

compared to value from https://raw.githubusercontent.com/raspberrypilearning/frustration/l10n_master/ar-SA/step_2.md:

+ احذف الكتل ` إلى الأبد` و ` عند بدء` بسحبها إلى اللوحة:

I was not able to see all the cases as described. @robertjank Could you take a look?

Maybe we should get some translaters for arabic to look at the output?