Visual aide of doublespace in edited string

[comradekingu]

Above the blue line.

If you make a triplespace, there are three dots.
Regular spaces have no dots.
Makes it visually apparent that there is a doublespace afoot.

[nijel]

This can be easily done in the the strings we display, there is no support for this in the editor as we use just simple textarea so far...

[nijel]

I've just implemented it for rendering strings, for the editor it's still open until we use something more complex for entering text.

[nijel]

From #3417 by @iriman:

Is your feature request related to a problem? Please describe.
Some characters are invisible and could have unwanted effects on the final translation. like directional characters such as LRE, RLE, etc.

Describe the solution you'd like
Making them visible, e.g. by name: <LRE>, <RLE>, etc.

Additional context
I'm specially speacking about these highlighted characters that sometimes need to be inserted in translations:

[yarons]

Well if I understand correctly in Pootle it's done via Webfonts and ignoring the directionality charaters altogether leading to a left aligned and reversed text with some black symbols that represent the directionality characters which are non existent characters with a symbol representation of the matching function.

This is how it looks like:
(The editor with the interpreted string)

(The "raw" version of the same string)

[nijel]

My intention is rather to go for some rich editor (for example CodeMirror) and highlight whitespace and special chars there. But frontend is not really my cup of tea....

[yarons]

Well, there's this project by a friend of mine (@tomer) called Pilcrow:
https://tomer.github.io/pilcrow/
This is the source code:
https://github.com/tomer/pilcrow

It could probably be fitted for our needs pretty easily.

[nijel]

What we need in textarea formatting, while this seems to format non-editable text. Anyway we're now using CodeMirror for some other features, so this should be possible using it as well, it just needs to be implemented ;-).

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