Removed wrong `nk_window_is_closed` in demos

demo/d3d11/main.c

@@ -241,7 +241,6 @@ int main(void)
             }
         }
         nk_end(ctx);
-        if (nk_window_is_closed(ctx, "Demo")) break;
 
         /* -------------- EXAMPLES ---------------- */
         /*calculator(ctx);*/

demo/gdi/main.c

@@ -141,7 +141,6 @@ int main(void)
             nk_property_int(ctx, "Compression:", 0, &property, 100, 10, 1);
         }
         nk_end(ctx);
-        if (nk_window_is_closed(ctx, "Demo")) break;
 
         /* -------------- EXAMPLES ---------------- */
         /*calculator(ctx);*/

demo/gdip/main.c

@@ -136,7 +136,6 @@ int main(void)
             nk_property_int(ctx, "Compression:", 0, &property, 100, 10, 1);
         }
         nk_end(ctx);
-        if (nk_window_is_closed(ctx, "Demo")) break;
 
         /* -------------- EXAMPLES ---------------- */
         /*calculator(ctx);*/

demo/sdl_opengl3/main.c

@@ -47,8 +47,8 @@
  * and the corresponding function. */
 /*#include "../style.c"*/
 /*#include "../calculator.c"*/
-/*#include "../overview.c"*/
-/*#include "../node_editor.c"*/
+/*#include "../overview.c" */
+/*#include "../node_editor.c" */
 
 /* ===============================================================
  *

demo/x11/main.c

@@ -179,7 +179,7 @@ main(void)
             nk_property_int(ctx, "Compression:", 0, &property, 100, 10, 1);
         }
         nk_end(ctx);
-        if (nk_window_is_closed(ctx, "Demo")) break;
+        if (nk_window_is_hidden(ctx, "Demo")) break;
 
         /* -------------- EXAMPLES ---------------- */
         /*calculator(ctx);*/

demo/x11_opengl2/main.c

@@ -289,7 +289,6 @@ int main(int argc, char **argv)
             }
         }
         nk_end(ctx);
-        if (nk_window_is_closed(ctx, "Demo")) break;
 
         /* -------------- EXAMPLES ---------------- */
         /*calculator(ctx);*/

demo/x11_opengl3/main.c

@@ -286,7 +286,6 @@ int main(int argc, char **argv)
             }
         }
         nk_end(ctx);
-        if (nk_window_is_closed(ctx, "Demo")) break;
 
         /* -------------- EXAMPLES ---------------- */
         /*calculator(ctx);*/