[Techdraw] Import SVG files with UTF-8 encoding (#18816)

* [Techdraw] Fix importing SVG files with UTF-8 encoding

* [Techdraw] fix Lint feedback

src/Mod/TechDraw/TDTest/DrawViewSymbolTest.py

@@ -1,5 +1,6 @@
 
 import FreeCAD
+import codecs
 import os
 import unittest
 from .TechDrawTestUtilities import createPageWithSVGTemplate
@@ -21,7 +22,26 @@ class DrawViewSymbolTest(unittest.TestCase):
         sym = FreeCAD.ActiveDocument.addObject("TechDraw::DrawViewSymbol", "TestSymbol")
         path = os.path.dirname(os.path.abspath(__file__))
         symbolFileSpec = path + "/TestSymbol.svg"
-        f = open(symbolFileSpec, "r")
+        f = codecs.open(symbolFileSpec, "r", encoding="utf-8")
+        svg = f.read()
+        f.close()
+        sym.Symbol = svg
+        self.page.addView(sym)
+        sym.X = 220.0
+        sym.Y = 150.0
+
+        FreeCAD.ActiveDocument.recompute()
+
+        self.assertTrue("Up-to-date" in sym.State)
+
+    def testNonAsciiSymbol(self):
+        """Tests if a Non-Ascii symbol can be added to page"""
+        sym = FreeCAD.ActiveDocument.addObject(
+            "TechDraw::DrawViewSymbol", "NonAsciiSymbol"
+        )
+        path = os.path.dirname(os.path.abspath(__file__))
+        symbolFileSpec = path + "/TestNonAsciiSymbol.svg"
+        f = codecs.open(symbolFileSpec, "r", encoding="utf-8")
         svg = f.read()
         f.close()
         sym.Symbol = svg
@@ -34,5 +54,6 @@ class DrawViewSymbolTest(unittest.TestCase):
         self.assertTrue("Up-to-date" in sym.State)
 
 
+
 if __name__ == "__main__":
     unittest.main()

src/Mod/TechDraw/TDTest/TestNonAsciiSymbol.svg

@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+
+<svg
+  xmlns="http://www.w3.org/2000/svg" version="1.1"
+  xmlns:freecad="http://www.freecad.org/wiki/index.php?title=Svg_Namespace"
+  width ="57.0mm"
+  height="10mm"
+  viewBox="0 0 57.0 10">
+    <g id="first-frame"
+      style="fill:#fff;fill-opacity:1;stroke:#000;stroke-width:0.5;stroke-linecap:round;stroke-linejoin:round;font-size:5.0;text-anchor:middle;font-family:osifont">
+        <rect width="56.5" height="9.5" x="0.25" y="0.25" />
+        <circle cx="5.0" cy="5.0" r="1.75" />
+        <path d="m 2 5 h 6  m -3 -3 v 6 " />
+        <path d="m 9.75 0.25 v 9.5 " />
+        <text freecad:editable="Value1" x="20.0" y="7" fill="#000"> <tspan>⌀ 0,01</tspan> </text>
+        <path d="m 28.25 0.25 v 9.5 " />
+        <text freecad:editable="Value2" x="34.0" y="7" fill="#000"> <tspan>Ä</tspan> </text>
+        <path d="m 37.75 0.25 v 9.5 " />
+        <text freecad:editable="Value3" x="43.5" y="7" fill="#000"> <tspan>Ö</tspan> </text>
+        <path d="m 47.25 0.25 v 9.5 " />
+        <text freecad:editable="Value4" x="53.0" y="7" fill="#000"> <tspan>Ü</tspan> </text>
+    </g>
+</svg>