Optional visibility for window header.

[nick87720z]

Under header i mean currently horizontal bar above window contents, which could be removed. Essentially it is not for all, but some people (more frequently using various lightweight wm) use only border, without header. In kwin buttons settings i tried to remove text - seems untuchable :)

[MilesBHuff]

This would be a nice feature :)
It's quite doable in the meantime though, if you hide titlebar icons, make the titlebar text miniscule & the same color as the window, etc.