Works with sun and IBL is failed .I think I need to study more about java programming with concentration.
Sharper = higher resolution = more memory. It would be probably a good idea to add this in preferences. Be sure to post a feature request to avoid I forget it
As you said I added a feature request .I would like to indicate some mistake that feels from my side.
1. Currently In virtual mode Observer angle become "Zero" when he look south.I think its a mistake because currently in positive angle(like 47/+47) value observer looks sunset. In civil/survey field positive value means observer looks sun rising.?
2. In 3d window Left top corner buttons are misplaced that means Upper arrow act as zoom in button instead of camera upwards(3rd button from top/above zoom out) and thus the others too.Camera Left and Right rotation works fine).
3. Svg exported file not working correctly.In Inkscape imported furniture and walls are placed randomly ,in illustrator a warning popup says "Item imported improperly. Clipping will be lost on roundtrip to Tiny".
4. Canvas does not need a negative value area or limit at a particular location.
I don't get the changes you made and indicated at here
As the correction is a tradeoff that could alter the image quality of the 3D view (mainly on the borders of walls, furniture...), please check if it works for you.
and at hereDid you notice at least some improvements about the 3D view resizing?
can you picturize it.? 
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