Allow the user to set the drag'n drop icon size through

Preferences > Advanced > Behavior > Drag'n drop icon size.
It is saved to rc file as dnd_icon_size.

src/dnd.c

@@ -32,7 +32,7 @@ GtkTargetEntry dnd_file_drop_types[] = {
 gint dnd_file_drop_types_count = 2;
 
 
-#define DND_ICON_SIZE 48
+#define DND_ICON_SIZE (options->dnd_icon_size)
 
 
 static void pixbuf_draw_border(GdkPixbuf *pixbuf, gint w, gint h)

src/globals.c

@@ -29,6 +29,7 @@ ConfOptions *init_options(ConfOptions *options)
 	options->color_profile.screen_type = 0;
 	options->color_profile.use_image = TRUE;
 
+	options->dnd_icon_size = 48;
 	options->duplicates_similarity_threshold = 99;
 	options->enable_metadata_dirs = FALSE;
 

src/preferences.c

@@ -267,6 +267,7 @@ static void config_window_apply(void)
 	options->tree_descend_subdirs = c_options->tree_descend_subdirs;
 
 	options->open_recent_list_maxsize = c_options->open_recent_list_maxsize;
+	options->dnd_icon_size = c_options->dnd_icon_size;
 
 #ifdef DEBUG
 	debug = debug_c;
@@ -1406,6 +1407,9 @@ static void config_tab_advanced(GtkWidget *notebook)
 
 	pref_spin_new_int(group, _("Open recent list maximum size"), NULL,
 			  1, 50, 1, options->open_recent_list_maxsize, &c_options->open_recent_list_maxsize);
+
+	pref_spin_new_int(group, _("Drag'n drop icon size"), NULL,
+			  16, 256, 16, options->dnd_icon_size, &c_options->dnd_icon_size);
 
 	group = pref_group_new(vbox, FALSE, _("Navigation"), GTK_ORIENTATION_VERTICAL);
 

src/rcfile.c

@@ -318,6 +318,7 @@ void save_options(void)
 
 	WRITE_BOOL(mousewheel_scrolls);
 	WRITE_INT(open_recent_list_maxsize);
+	WRITE_INT(dnd_icon_size);
 	WRITE_BOOL(place_dialogs_under_mouse);
 
 
@@ -608,7 +609,7 @@ void load_options(void)
 		READ_BOOL(mousewheel_scrolls);
 
 		READ_INT(open_recent_list_maxsize);
-
+		READ_INT(dnd_icon_size);
 		READ_BOOL(place_dialogs_under_mouse);
 
 

src/typedefs.h

@@ -760,6 +760,7 @@ struct _ConfOptions
 	gint duplicates_similarity_threshold;
 
 	gint open_recent_list_maxsize;
+	gint dnd_icon_size;
 
 	/* file ops */
 	struct {