[INFOREQ] Qtip header add a line break for each space

REQUIRED INFORMATION
Ext version tested:
Ext 4.1.3.548

Browser versions tested against:
FF18

IE8,9,10

Safari 6

Chrome

DOCTYPE tested against:
<!DOCTYPE html>

Description:
If I add an qtip for a tree node with

PHP Code:

node.set('qtitle','my funny header'); node.set('qtip','my funny text foobar');

The qtip header has for each space in "my funny header" a line break.
This is only if the tip is showing for the first time. after that, the qtip header looks like expected.

If I add the qtitle with non breaking space,

PHP Code:

node.set('qtitle','my funny header');

The qtip header looks like expected.