DPI selection on basic PNG export

[m-malyarenko]

Issue

Since diagrams are constructed as a vector graphic it is sometimes hard to tell if it is "big" or "small" relative to its actual size and font size. Exporting "small" diagrams to PNG leads to poor image resolution and artifacts. As I know there are two general solutions for this proplem:

• to increase overall size of the diagram and tweak size of elements and font which is really boilerplate and inefficient
• to export diagram as PNG in Advanced mode, where DPI of an output image can be increased

Proposed solution

I suggest adding DPI selection dropdown list to basic Export as PNG tab as it will keep workflow simple and straightforward while providing more control over PNG output