Code formatting breaks when encountering a "\" character

[tomrav]

Actual Behavior

This happens primarily with a \ inside any rule, causing a weird duplication, over and over.

Before formatting:

.root {
    color: red;\
    background: gold;
}

After formatting:

.root {
    color: red;
    \
 background: gold;background
    background
}

After another formatting (and so it repeats):

.root {
    color: red;
    \
 background: gold;background
    backgroundbackground background
}

Expected Behavior

should not break source files.

Version

4.6.0