#8725 (Fast rendering) and #8733 (Better formating scales) and fix #8776 #922
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#8725: Fast rendering of LineStrings and Polygons pre-applying a view threshold filter to the geometries to render in qgis. View Table of test results in 'http://hub.qgis.org/issues/8725'
#8733: Better formating scales
#8776: Set the canvas color in 'qgsprojectproperties::apply()' before refresh