Closing Tux Paint before the end of font scanning resulted in crashes in the Android port.

src/dirwalk.c

@@ -82,7 +82,11 @@ void loadfont_callback(SDL_Surface * screen, SDL_Texture * texture, SDL_Renderer
 {
   dirlen = dirlen;
 
+#ifndef FORKED_FONTS && #defined __ANDROID__
+  while (i-- && !font_thread_aborted)
+#else
   while (i--)
+#endif
     {
       int loadable = 0;
       const char *restrict const cp = strchr(files[i].str, '.');

src/fonts.c

@@ -1519,7 +1519,11 @@ int charset_works(TuxPaint_Font * font, const char *s)
   unsigned count = 0;
   int ret = 0;
 
+#ifndef FORKED_FONTS && #defined __ANDROID__
+  while (*s && !font_thread_aborted)
+#else
   while (*s)
+#endif
     {
       char c[8];
       unsigned offset = 0;

src/tuxpaint.c

@@ -5779,6 +5779,12 @@ static void mainloop(void)
       SDL_Delay(1);
     }
   while (!done);
+#ifndef FORKED_FONTS && #defined __ANDROID__
+  /* Closing Tux Paint before the end of font scanning resulted in crashes in the Android port */
+  /* This is an abuse of font_thread_aborted, maybe it is better to use a new, more descriptive marker? */
+  if(!font_thread_done)
+    font_thread_aborted = 1;
+#endif
 }
 
 /**