Please have a look at: https://bugs.launchpad.net/bugs/167422
"When zoomed out enough to hide minor grid lines, major
grid lines get drawn with the minor grid line color."
"I regret this was "fixed". Now you have major lines visible when there
are no minors visible; now the grid is way too visible for my linkings
when zoomed out.
I feel there should only be highlighted lines when there is actually
something to be highlighted. When zoomed out, you see all lines
So I either would like to have
A. the old behaviour back: (only use major highlighting when minors are
visible, otherwise use minor color for all lines). or
B. have major/minor all the time. E.g. with a highlighted 'major' line
for all zooms."
Option B is not handy always and should be something can can be turned
Option A might also be put under a checkbox (what will be the default?)