Add method for estimating the maximum amount a symbol bleeds out of the drawn polygon. Eg, half of the border width is actually drawn outside of a rectangle. Calculated values are an estimate only since the symbology may be affected by data defined parameters.
[composer] Make sure entire page symbol border is included when exporting compositions. Previously half the page border would be cropped out. Also fix nIRV's infamous 1px bad row at bottom of composer exports bug.
[tests] Update composition based tests now that 1px bad row bug is fixed
[tests] Add test for composer paper styles