Delay whitespace warning in XfceFilenameInput
Add a delay to the warning about the text ending in whitespace to XfceFilenameInput, so that the warning does not keep appearing and disappearing as the user types a filename containing spaces.
I have made the delay 500 milliseconds, which seems about right for the speed I type at, but I'm very happy to use a different value if anyone wants.
Edited by Alexander Schwinn