Cleanup: Use raw string literal

Resolves modernize-raw-string-literal Clang-Tidy warning

The way warning works is it suggests to use raw literal when
overhead of having escape characters is higher than the overhead
of having raw literal syntax (talking about code size overhead).
This means that the warning will not trigger for "foo\"bar".

Differential Revision: https://developer.blender.org/D10322

.clang-tidy

@@ -39,7 +39,6 @@ Checks:  >
   -modernize-use-nodiscard,
   -modernize-loop-convert,
   -modernize-pass-by-value,
-  -modernize-raw-string-literal,
 
 WarningsAsErrors: '*'
 CheckOptions:

source/blender/blenlib/intern/delaunay_2d.cc

@@ -561,14 +561,14 @@ template<typename T> void cdt_draw(const std::string &label, const CDTArrangemen
     const vec2<double> &uco = u->co.approx;
     const vec2<double> &vco = v->co.approx;
     int strokew = e->input_ids == nullptr ? thin_line : thick_line;
-    f << "<line fill=\"none\" stroke=\"black\" stroke-width=\"" << strokew << "\" x1=\""
+    f << R"(<line fill="none" stroke="black" stroke-width=")" << strokew << "\" x1=\""
       << SX(uco[0]) << "\" y1=\"" << SY(uco[1]) << "\" x2=\"" << SX(vco[0]) << "\" y2=\""
       << SY(vco[1]) << "\">\n";
     f << "  <title>" << vertname(u) << vertname(v) << "</title>\n";
     f << "</line>\n";
     if (draw_edge_labels) {
       f << "<text x=\"" << SX((uco[0] + vco[0]) / 2) << "\" y=\"" << SY((uco[1] + vco[1]) / 2)
-        << "\" font-size=\"small\">";
+        << R"(" font-size="small">)";
       f << vertname(u) << vertname(v) << sename(&e->symedges[0]) << sename(&e->symedges[1])
         << "</text>\n";
     }
@@ -576,13 +576,13 @@ template<typename T> void cdt_draw(const std::string &label, const CDTArrangemen
 
   int i = 0;
   for (const CDTVert<T> *v : cdt.verts) {
-    f << "<circle fill=\"black\" cx=\"" << SX(v->co.approx[0]) << "\" cy=\"" << SY(v->co.approx[1])
+    f << R"(<circle fill="black" cx=")" << SX(v->co.approx[0]) << "\" cy=\"" << SY(v->co.approx[1])
       << "\" r=\"" << vert_radius << "\">\n";
     f << "  <title>[" << i << "]" << v->co.approx << "</title>\n";
     f << "</circle>\n";
     if (draw_vert_labels) {
       f << "<text x=\"" << SX(v->co.approx[0]) + vert_radius << "\" y=\""
-        << SY(v->co.approx[1]) - vert_radius << "\" font-size=\"small\">[" << i << "]</text>\n";
+        << SY(v->co.approx[1]) - vert_radius << R"(" font-size="small">[)" << i << "]</text>\n";
     }
     ++i;
   }

source/blender/blenlib/intern/dot_export.cc

@@ -275,10 +275,10 @@ NodeWithSocketsRef::NodeWithSocketsRef(Node &node,
 {
   std::stringstream ss;
 
-  ss << "<<table border=\"0\" cellspacing=\"3\">";
+  ss << R"(<<table border="0" cellspacing="3">)";
 
   /* Header */
-  ss << "<tr><td colspan=\"3\" align=\"center\"><b>";
+  ss << R"(<tr><td colspan="3" align="center"><b>)";
   ss << ((name.size() == 0) ? "No Name" : name);
   ss << "</b></td></tr>";
 
@@ -291,7 +291,7 @@ NodeWithSocketsRef::NodeWithSocketsRef(Node &node,
       if (name.size() == 0) {
         name = "No Name";
       }
-      ss << "<td align=\"left\" port=\"in" << i << "\">";
+      ss << R"(<td align="left" port="in)" << i << "\">";
       ss << name;
       ss << "</td>";
     }
@@ -304,7 +304,7 @@ NodeWithSocketsRef::NodeWithSocketsRef(Node &node,
       if (name.size() == 0) {
         name = "No Name";
       }
-      ss << "<td align=\"right\" port=\"out" << i << "\">";
+      ss << R"(<td align="right" port="out)" << i << "\">";
       ss << name;
       ss << "</td>";
     }

source/blender/depsgraph/intern/debug/deg_debug_relations_graphviz.cc

@@ -184,7 +184,7 @@ static void deg_debug_graphviz_legend(DotExportContext &ctx)
 
   std::stringstream ss;
   ss << "<";
-  ss << "<TABLE BORDER=\"0\" CELLBORDER=\"1\" CELLSPACING=\"0\" CELLPADDING=\"4\">";
+  ss << R"(<TABLE BORDER="0" CELLBORDER="1" CELLSPACING="0" CELLPADDING="4">)";
   ss << "<TR><TD COLSPAN=\"2\"><B>Legend</B></TD></TR>";
 
 #ifdef COLOR_SCHEME_NODE_CLASS

source/blender/depsgraph/intern/debug/deg_debug_stats_gnuplot.cc

@@ -87,7 +87,7 @@ string gnuplotify_name(const string &name)
   for (int i = 0; i < length; i++) {
     const char ch = name[i];
     if (ch == '_') {
-      result += "\\\\\\";
+      result += R"(\\\)";
     }
     result += ch;
   }