Word wrap button labels on hypens/dashes (-)

e.g. Norwegian Nynorsk "ROGGBIF-regnboge" will appear as

  ROGGBIF-
  regnboge

rather than all crammed on one line and impossible to read.

h/t Karl for the idea.  (Next up: support soft-hyphens)

For https://sourceforge.net/p/tuxpaint/bugs/288/

docs/CHANGES.txt

@@ -81,6 +81,12 @@ https://tuxpaint.org/
       Closes https://sourceforge.net/p/tuxpaint/feature-requests/229/
       Bill Kendrick <bill@newbreedsoftware.com>
 
+    * Button labels word-wrap on hyphens/dashes ("-") now too.
+      TODO And on soft-hyphens.
+      Closes https://sourceforge.net/p/tuxpaint/bugs/288/
+      (h/t Karl Ove Hufthammer for suggesting)
+      Bill Kendrick <bill@newbreedsoftware.com>
+
     * Make screen refresh more snappy on macOS.
       Mark Kim <markuskimius@gmail.com>
 

src/tuxpaint.c

@@ -9570,11 +9570,14 @@ static SDL_Surface *do_render_button_label(const char *const label)
 
   if (tmp_surf1->w >= button_w * 1.5)
   {
+    int i, found = -1;
+    char * broken_str;
+
+
     DEBUG_PRINTF("'%s' is very wide (%d) compared to button size (%d)\n", upstr, tmp_surf1->w, button_w);
     if (strstr(upstr, " ") != NULL)
     {
-      int i, found = -1;
+      /* Try to wrap on a space */
-
       for (i = (strlen(upstr) * 3 / 4); i >= 0 && found == -1; i--)
       {
         if (upstr[i] == ' ')
@@ -9590,6 +9593,40 @@ static SDL_Surface *do_render_button_label(const char *const label)
         SDL_FreeSurface(tmp_surf1);
         tmp_surf1 = render_text(myfont, upstr, black);
 
+        height_mult = 1.5;
+      }
+    }
+    else if (strstr(upstr, "-") != NULL)
+    {
+      /* Try to wrap on a visible hyphen/dash */
+      for (i = (strlen(upstr) - 1); i >= 0 && found == -1; i--)
+      {
+        if (upstr[i] == '-')
+        {
+          found = i;
+        }
+      }
+
+      if (found != -1)
+      {
+        SDL_FreeSurface(tmp_surf1);
+
+        broken_str = alloca(sizeof(wchar_t) * strlen(upstr) + 2);
+        if (broken_str != NULL) {
+          for (i = 0; i <= found; i++) {
+            broken_str[i] = upstr[i];
+          }
+          broken_str[i] = '\n';
+          for (i = found + 1; i < (int) strlen(upstr); i++) {
+            broken_str[i + 1] = upstr[i];
+          }
+          broken_str[i + 1] = '\0';
+
+          tmp_surf1 = render_text(myfont, broken_str, black);
+        } else {
+          tmp_surf1 = render_text(myfont, upstr, black);
+        }
+
         height_mult = 1.5;
       }
     }