Change width()'s return type from int to unsigned

src/libunicode/capi.cpp

@@ -49,7 +49,7 @@ int u32_gc_width(u32_char_t const* codepoints, size_t size, int mode)
     while (segmenter.codepointsAvailable())
     {
         auto const cluster = *segmenter;
-        int thisWidth = unicode::width(cluster.front());
+        int thisWidth = static_cast<int>(unicode::width(cluster.front()));
         if (mode != GC_WIDTH_MODE_NON_MODIFIABLE)
         {
             for (size_t i = 1; i < size; ++i)
@@ -60,7 +60,7 @@ int u32_gc_width(u32_char_t const* codepoints, size_t size, int mode)
                     {
                         case 0xFE0E: return 1;
                         case 0xFE0F: return 2;
-                        default: return unicode::width(codepoint);
+                        default: return static_cast<int>(unicode::width(codepoint));
                     }
                 }();
                 if (width && width != thisWidth)

src/libunicode/width.cpp

@@ -18,7 +18,7 @@
 namespace unicode
 {
 
-int width(char32_t codepoint) noexcept
+unsigned width(char32_t codepoint) noexcept
 {
     return codepoint_properties::get(codepoint).char_width;
 }

src/libunicode/width.h

@@ -17,6 +17,6 @@ namespace unicode
 {
 
 /// Returns the number of text columns the given codepoint would need to be displayed.
-int width(char32_t codepoint) noexcept;
+unsigned width(char32_t codepoint) noexcept;
 
 } // namespace unicode