major/minor grid and zoom

[Helge Hielscher]

Current Situation:
When one zooms out the minor grid disappears and only the major grid is displayed. Now all grid lines look the same. With further zoom-out only some lines of the major grid are displayed.
Problem:
With only major lines it is difficult to count blocks because there is no further division. With hidden lines it is even more difficult to use the grid for orientation, e.g. if one zooms in to work on a detail the grid changes as well, without any indication of what guides are the ones that have been there at the previous zoom level and which are new.
Proposed Solution:
There is already a setting: Major grid line every n lines.
This could be used to mark every n-th major line bold as well. They are still distinguishable because they have different color.
Analogy: Some graph paper has thin lines every millimeter, stronger lines ever 5mm and again stronger lines every 10mm.

[Mattia Rizzolo (mapreri)]

Old related bug: https://bugs.launchpad.net/inkscape/+bug/167422