[PATCH RFC v2 2/9] docs-rst: improve output for .. notes:: on LaTeX

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The output for those notes are bad in pdf, as they're not
in a box with a different color. Also, it causes the output
to not build if the note is inside a table.

Change its implementation to avoid the above troubles.

The logic there came from:
	https://stackoverflow.com/questions/606746/how-to-customize-an-existing-latex-environment-without-interfering-with-other-en

Signed-off-by: Mauro Carvalho Chehab <mchehab@xxxxxxxxxxxxxxxx>
---
 Documentation/conf.py | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/Documentation/conf.py b/Documentation/conf.py
index 9ed1a2e39b4f..bbf2878d9945 100644
--- a/Documentation/conf.py
+++ b/Documentation/conf.py
@@ -264,6 +264,29 @@ latex_elements = {
     'preamble': '''
         % Allow generate some pages in landscape
         \\usepackage{lscape}
+
+        % Put notes in gray color and let them be inside a table
+
+        \\definecolor{MyGray}{rgb}{0.80,0.80,0.80}
+
+        \\makeatletter\\newenvironment{graybox}{%
+           \\begin{lrbox}{\\@tempboxa}\\begin{minipage}{\\columnwidth}}{\\end{minipage}\\end{lrbox}%
+           \\colorbox{MyGray}{\\usebox{\\@tempboxa}}
+        }\\makeatother
+
+        \\makeatletter
+        \\renewenvironment{notice}[2]{
+          \\begin{graybox}
+          \\bf\\it
+          \\def\\py@noticetype{#1}
+          \\par\\strong{#2}
+          \\csname py@noticestart@#1\\endcsname
+        }
+	{
+          \\csname py@noticeend@\\py@noticetype\\endcsname
+          \\end{graybox}
+        }
+	\\makeatother
      '''
 }
 
-- 
2.7.4


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