added wxFont::IsFixedWidth(), documented it and implemented for wxGTK/Motif

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@13570 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

docs/latex/wx/font.tex

@@ -174,6 +174,13 @@ the application should try to clean up all fonts itself. This is because
 wxWindows cannot know if a pointer to the font object is stored in an
 application data structure, and there is a risk of double deletion.
 
+\membersection{wxFont::IsFixedWidth}\label{wxfontisfixedwidth}
+
+\constfunc{bool}{IsFixedWidth}{\void}
+
+Returns {\tt TRUE} if the font is a fixed width (or monospaced) font, 
+{\tt FALSE} if it is a proportional one or font is invalid.
+
 \membersection{wxFont::GetDefaultEncoding}\label{wxfontgetdefaultencoding}
 
 \func{static wxFontEncoding}{GetDefaultEncoding}{\void}