There is no reason to reserve pixel space in macros replacement text,
which is not editable. This makes macros more compact and eases the
writing of lib/symbols.
* introduce new InsetMath::drawMarkers and friends that do nothing
when nested inside a macro. This required to move macro_nesting
inside MetricsBase, and to pass MetricsInfo & to metricsMarkers.
* keep track of nesting when drawing rows or macros.
The small ascii art in InsetMathCancel::draw has line continuation characters at
eol, this make consecutive lines be andled as one. The use of a block comment
instead of single line comments makes this less of a "problem." Also it removes
a warning with gcc 4.7.
git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@40699 a592a061-630c-0410-9148-cb99ea01b6c8
