[Qgis-developer] Strange debug messages

[Golubev]

I have these messages to console after maximizing QGIS/moving toolbars, 
but resizing QGIS window doesnt show them:
...
..\..\..\src\src\core\qgsmaprenderer.cpp(616) : (QgsMapRenderer::render) 
Rendering completed in (seconds): 2.236
QPainter::begin: Paint device returned engine == 0, type: 1
QPainter::setRenderHint: Painter must be active to set rendering hints
QPainter::setRenderHint: Painter must be active to set rendering hints
QPainter::worldTransform: Painter not active
QPainter::save: Painter not active
QPainter::restore: Unbalanced save/restore
QPainter::setWorldTransform: Painter not active
QPainter::save: Painter not active
QPainter::setOpacity: Painter not active
QPainter::restore: Unbalanced save/restore
QPainter::setWorldTransform: Painter not active
QPainter::end: Painter not active, aborted

Is this something bad? Tested on QGIS 1.7.0/1.7.1, Win 7 Pro, Qt 4.7.4