Only perform the longish check for latex support if the user has enabled latex in ACE.

src/common/gajim.py

@@ -183,7 +183,7 @@ else:
 		HAVE_GPG = False
 
 import latex
-HAVE_LATEX = latex.check_for_latex_support()
+HAVE_LATEX = config.get('use_latex') and latex.check_for_latex_support()
 
 HAVE_INDICATOR = True
 try:

src/features_window.py

@@ -243,7 +243,8 @@ class FeaturesWindow:
 		return sleepy.SUPPORTED
 
 	def latex_available(self):
-		return gajim.HAVE_LATEX
+		from common import latex
+		return latex.check_for_latex_support()
 
 	def pycrypto_available(self):
 		return gajim.HAVE_PYCRYPTO