Comment 13 for bug 370034

Copy-paste explanation of functionality request:
On the ruler, one can setup tab stops. However, the tab stops are not snapping
at specific intervals like if there was a grid. They are free floating, which
make them difficult to manage and set them at a proper place, specially when
working on a high resolution screen. By default, they should snap, snapping
should be an option that can be enabled/disabled and the interval for the snap
grid should be configurable.