Hum... it's a bit of a shame that
is replaced by a common space when in the description editor I get back from the HTML source tab to the Normal view tab.
In France for example, many punctuations need to be preceded by an unbreakable space.An unbreakable space is also very often used as thousands separator where English writers use a comma. The two quotation marks « and » do also need an unbreakable space when we want to write correctly.
These three situations are for example extremely useful when the lines are very short in the GUI to show the text as it it for the description of a book at the rightmost region of the Calibre GUI.
There are also other situations where the unbreakable space is very useful.
Writers should be free to use them or not.
Please Kovid, could you fix that very annoying filter ?
Jacques