Sets the amount of spacing in Pango unit between
the lines of the layout.
When placing lines with spacing, Pango arranges things so that
line2.top = line1.bottom + spacing
Note: Since 1.44, Pango defaults to using the line height
(as determined by the font) for placing lines. The @spacing
set with this function is only taken into account when the
line height factor is set to zero with
[method@Pango.Layout.set_line_spacing].
Sets the amount of spacing in Pango unit between the lines of the layout.
When placing lines with spacing, Pango arranges things so that
line2.top = line1.bottom + spacing
Note: Since 1.44, Pango defaults to using the line height (as determined by the font) for placing lines. The @spacing set with this function is only taken into account when the line height factor is set to zero with [method@Pango.Layout.set_line_spacing].