Added (unused) definition and images for a minimal-style vertical scrollbar

Horizontal scrollbar still requires images

data/gui/default/widget/vertical_scrollbar_default.cfg

@@ -114,6 +114,25 @@ if(positioner_length - {POSITIONER_TOP} - {POSITIONER_BOTTOM} < 0
 
 [/vertical_scrollbar_definition]
 
+#
+# This is meant to be used for a minimal scrollbar definition, removing the
+# up/down toggle buttons and reducing the width of the bar by 8 px.
+# However, since the toggle buttons on a scrollbar panel aren't definition-
+# dependent, this is commented out for now.
+#
+#[vertical_scrollbar_definition]
+#	id = "minimal"
+#	description = "a minimal vertical scrollbar"
+#
+#	# Note a scrollbar is normally sized by the item that "masters" it
+#	# that's why the default height is rather low.
+#
+#	# Tiny gui sizes haven't been tested yet so might need some tuning.
+#	{_GUI_RESOLUTION ({GUI_TINY__RESOLUTION}) 12 20 11 2 2 2 2 ()}
+#	{_GUI_RESOLUTION ()                       17 20 11 4 5 4 4 ()}
+#
+#[/vertical_scrollbar_definition]
+
 [vertical_scrollbar_definition]
 	id = "transparent"
 	description = "a transparent vertical scrollbar"