Comment 2 for bug 1355137

Not being a developer I don't have enough knowledge to do a patch that can be integrated and packaged.
These modified files reduce the problem significantly, but only:
 • for the Ambiance theme, if another theme is applied the benefits are lost
 • for a UI scaling factor of 2
There would be a switch needed which files to use depending on the integer value of the UI scaling factor. Ideally it would be patched in the software that reads these gtkrc files, and apply integer scaling to these dimensions (size, width, height, length).