clang-tidy: Enable performance-inefficient-string-concatenation

Enables the clang-tidy test performance-inefficient-string-concatenation
and replaces all inefficient string concatenations with `cmStrCat`.

Closes: #19555

1 files changed, 1 insertions, 1 deletions

diff --git a/Source/cmRST.cxx b/Source/cmRST.cxx
index a329f7d..1f9aae8 100644
--- a/Source/cmRST.cxx
+++ b/Source/cmRST.cxx
@@ -342,7 +342,7 @@ void cmRST::OutputMarkupLines(bool inlineMarkup)
 {
   for (auto line : this->MarkupLines) {
     if (!line.empty()) {
-      line = " " + line;
+      line = cmStrCat(" ", line);
     }
     this->OutputLine(line, inlineMarkup);
   }