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** Patch added: "customfonts.py.patch"
   https://bugs.launchpad.net/bugs/691442/+attachment/1768455/+files/customfonts.py.patch

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https://bugs.launchpad.net/bugs/691442

Title:
  The TTFSearchPath changed at outside module is ignored

Status in OpenObject Server:
  New

Bug description:
  There are 3 variable defined in report.render.rml2pdf.customfonts module: TTFSearchPath_Linux, TTFSearchPath_Windows, TTFSearchPath_Darwin, all refers to tuple object. They are refereed in the TTFSearchPathMap dict like below:
TTFSearchPathMap = {
    'Darwin': TTFSearchPath_Darwin,
    'Windows': TTFSearchPath_Windows,
    'Linux': TTFSearchPath_Linux,
}

If at later time I make 3 TTFSearchPath variable refers to other tuple object (eg. change the search path), these changes won't affect the TTFSearchPath* in TTFSearchPathMap dict, as they are still refered to the original tuple object.

I propose to replace immutable tuple to list, thus all changes to these variable will count in the later process.

patch is attached