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setup: Save selected game when browsing menus.

Once a game type (IWAD) has been selected, remember that selection
rather than resetting to the first item in the list when the window is
closed and reopened. This fixes #169 (thanks Alexandre Xavier).

--- a/src/setup/multiplayer.c

+++ b/src/setup/multiplayer.c

@@ -66,7 +66,7 @@

 // Index of the currently selected IWAD

-static int found_iwad_selected;

+static int found_iwad_selected = -1;

 // Filename to pass to '-iwad'.

@@ -599,9 +599,15 @@

         result = (txt_widget_t *) dropdown;

     }

-    // Select first in the list.

+    // The first time the dialog is opened, found_iwad_selected=-1,

+    // so select the first IWAD in the list. Don't lose the setting

+    // if we close and reopen the dialog.

-    found_iwad_selected = 0;

+    if (found_iwad_selected < 0 || found_iwad_selected >= num_iwads)

+    {

+        found_iwad_selected = 0;

+    }

+

     IWADSelected(NULL, NULL);

     return result;