I mean, declaring longtable "center" is harmless with [c] property:
\begin{longtable}[c]{lcl} ... \end{longtable} when the user choose "center" in longtable property dialog window. I have not checked the lyx source code, But I think LyX maybe do some extra check to intenionally omit [c] setting? At 2017-06-05 09:13:54, "Scott Kostyshak" <skost...@lyx.org> wrote: >On Sun, May 28, 2017 at 10:12:39AM +0800, subaochen wrote: >> hi all, >> >> >> Longtable in LyX is centered default, and floatrow package also centered >> table default, but according to >> https://tex.stackexchange.com/questions/320592/floatrow-package-conflicting-with-centering-longtable >> , when using floatrow and longtable together, longtable should be declared: >> >> >> \begin{longtable}[c]{ccc} >> ... >> >> >> Or, longtable will left aligned. >> >> >> The problem is, LyX ommit "[c]" when inserting a longtable, I can not find >> anyway to add ommited "[c]":-(. So please explicitly add "[c]" to >> \begin{longtable} declaration from table property dialog window, thanks very >> much! > >The SE link suggests that the behavior might be due to a bug in floatrow >(if I understand David's use of "strange reason" correctly). > >In LyX I think we try not to work around too many bugs in LaTeX packages. > >Scott