Strange behavior while parsing Qt stylesheets

When I put an whitespace between 'qlineargradient' and opening brace, I get error 'Could not parse application stylesheet'.

/* works */
qlineargradient( /.../ )

/* doesn't work */
qlineargradient ( /* ...*/ )

The same behavior I noticed with url(), etc.

If there are braces inside the braces, the situation becomes more complicated.

/* works */
background-color: qlineargradient(spread:reflect, stop: 0 rgb(102, 102, 102) );

/* doesn't work */
background-color: qlineargradient( spread:reflect, stop: 0 rgb(102, 102, 102) );

Now I can't put whitespace after the opening brace too.

Is it the desired behavior or it's some kind of bug?

SUGGESTION: Remove the dependancy on whitespaces.