espacement paragraphes et fonction pour cacher du texte

latex/ysbeamer.tex

@@ -110,5 +110,15 @@
 \tikzstyle{crashfloyd} = [basefloyd, fill=red!20]
 \tikzstyle{invfloyd} = [basefloyd, fill=green!20]
 
+\newcommand<>\placehold[1]{%
+  \setbox\@tempboxa\hbox{#1}%
+  % Use the below definition if color goes wrong
+  % \setbox\@tempboxa\hbox{\color@begingroup#1\color@endgroup}%
+  \alt#2{\box\@tempboxa}{\hbox to \wd\@tempboxa{\hfill}}%
+}
+
+\mode<article>{\parskip=1ex plus .5ex minus 0.5ex}
+\mode<presentation>{\parskip=1ex plus .5fill minus 0.75ex}
+
 \makeatother
 \endinput