Only show tag in chart if utf8 character width is within the width

- Closes #309

Signed-off-by: Thomas Lauf <thomas.lauf@tngtech.com>

src/Chart.cpp

@@ -35,6 +35,7 @@
 #include <cassert>
 #include <timew.h>
 #include <Chart.h>
+#include <utf8.h>
 
 ////////////////////////////////////////////////////////////////////////////////
 Chart::Chart (const ChartConfig& configuration) :
@@ -493,7 +494,23 @@ void Chart::renderInterval (
     if (width)
     {
       std::vector<std::string> text_lines;
+
+      // --
+      // The hang/memory consumption in #309 is due to a bug in libshared's wrapText
+      // It would be best to make wrapText/extractText width be the count of characters on the screen (and not a byte width).
+      // This fix will only show the tag if the utf8 character width is within the width (and it won't try to wrap),
+      // but otherwise functions normally for text where the utf-8 width matches the byte length of the label.
+      //
+      size_t utf8_characters = utf8_text_width (label);
+      if (static_cast <size_t>(width) >= utf8_characters)
+      {
+        text_lines.push_back (label);
+      }
+      else if (utf8_characters == label.size ())
+      {
         wrapText (text_lines, label, width, false);
+      }
+      // --
 
       for (unsigned int i = 0; i < lines.size (); ++i)
       {