There are two problems I'm trying to solve here.
1) Somewhere along the way, exprToFunction gained a hardcoded
assumption that two stack frames up is a variable "expr",
meaning anything that called installExprFunction had to have
the first argument be exactly "expr". I think I got this
fixed, now the only assumption made by both installExprFunc
and exprToFunc is if they are called with quoted = FALSE,
then the caller is merely passing through code that originated
exactly one more level up the stack frame. If the code is
less than one level up, i.e. an end user is directly passing
code into installExprFunction or exprToFunction, then it won't
work; and if the code is more than one level up (someone is
passing code into function A which passes through to function
B which calls installExprFunction, with quoted = FALSE) then
it also won't work.
2) registerDebugHook calls were broken in various places by the
name/envir registered with the hook being different than the
name/envir through which the function was actually called.
This generally seems fixable by moving the registerDebugHook
call closer to the name/envir that will ultimately be called
(e.g. call registerDebugHook directly from wrapFunctionLabel).
There still seems to be a problem here in that breakpoints in
RStudio are hit but then the IDE automatically runs "n" multiple
times. Also the unit tests don't currently pass, I haven't
investigated that yet.
The css function is in htmltools 0.2.11, which isn't on CRAN
yet. Due to a perfect storm of release scheduling we need to
get fillPage onto shiny master before we have a chance to
put htmltools on CRAN.
I decided against the name flexRow/flexCol as the "flex" prefix
is too general for these implementations, which are mostly just
useful for filling the space with the children. Flex box has a
lot more features than that, such as centering, wrapping,
justifying, etc., but I don't currently know how to design an
API that presents the full power of flex box without also
presenting the full complexity of it as well.
This commit also includes some tweaks to the impl of flexfill
to fix the behavior of children with 100% size along the main
axis, and also introduces support for NA flex values, which
sizes the flex item according to its contents.
