Fix inventory UI highlight not displayed when opening the UI or resiz…

…ing the window

src/inventory_ui.cpp

@@ -1703,6 +1703,10 @@ void inventory_selector::refresh_window()
 {
     cata_assert( w_inv );
 
+    if( get_option<std::string>( "INVENTORY_HIGHLIGHT" ) != "disable" ) {
+        highlight();
+    }
+
     werase( w_inv );
 
     draw_frame( w_inv );
@@ -2120,9 +2124,6 @@ item_location inventory_pick_selector::execute()
 {
     shared_ptr_fast<ui_adaptor> ui = create_or_get_ui_adaptor();
     while( true ) {
-        if( get_option<std::string>( "INVENTORY_HIGHLIGHT" ) != "disable" ) {
-            highlight();
-        }
         ui_manager::redraw();
         const inventory_input input = get_input();
 
@@ -2466,9 +2467,6 @@ drop_locations inventory_drop_selector::execute()
 
     int count = 0;
     while( true ) {
-        if( get_option<std::string>( "INVENTORY_HIGHLIGHT" ) != "disable" ) {
-            highlight();
-        }
         ui_manager::redraw();
 
         const inventory_input input = get_input();

src/ui_manager.h

@@ -98,7 +98,13 @@ namespace ui_manager
 {
 // rect is the pixel dimensions in tiles or console cell dimensions in curses
 void invalidate( const rectangle<point> &rect, bool reenable_uis_below );
-// invalidate the top window and redraw all invalidated windows
+/*
+ * Invalidate the top window and redraw all invalidated windows.
+ * Note that `ui_manager` may redraw multiple times when the game window is
+ * resized or the system requests a redraw during input calls, so any drawing
+ * code and other code that generates non-persistent UI info should be called
+ * inside the redraw callbacks of `ui_adaptor`, instead of being called directly.
+ */
 void redraw();
 // redraw all invalidated windows without invalidating the top window
 void redraw_invalidated();