I truly consider this is a very high priority bug. It made Kompozer completely not usable for asian website creation.
It's actually very small bug, Kompozer should never, never add linebreak between ideographs. Kompozer add linebreak between ideographs when the line is too long in source. The result is in browsers the two ideograph looks having a space between them.
In Asian typography it's strictly clear no white space is allowed between ideographs unless in very special cases (e.g. printing the name of the God in Bible).
This happen because Kompozer tries to line-wrap source code, when it cannot (e.g. because there are 80 ideographs with no space in between), it force a linebreak at some 70 position.
In fact, in Chinese it is possible a whole book do not use a single space between any of two ideographs. Actually most books do.
The best thing is Kompozer insert linebreak for line wrapping in source code only after Chinese punctuations. If this is not possible, Kompozer should know to never to force a linebreak if there is no space in source code.
If you need I can give you a list of Chinese punctuations after which a linebreak can be added for line wrapping.