seems msrc cannot has space in the filename

[huhongbo]

when I have the data like
src="https://xx.xx.com/has 3space.jpg"
msrc="https://xx.xx.com/has 3space.thumbnail.jpg"

the thumbnail background maybe empty blank or have a random picture, but the 'src' is working fine.

[GuoQichen]

Spaces in URIs/URLs should be encoded using %20. Some browsers might auto-correct invalid links in double-quotes with un-encoded spaces in it, but you should not rely on it.

[huhongbo]

I already change to the code to replace space, just report it.