Fix FS#12606 - next track can cause the screen to be cleared

This is a bit of a hack. We now trigger an event when the skin engine
is doing a full redraw (which means fullscreen clear) before the
lcd_update() to give the current screen a chance to redraw to avoid the
screen flicker.

This commit fixes the issue for screens which are entirely the list
widget (i.e browser and menus), other screens will need aditional fixes
(i.e quickscreen, time&date screen)

Change-Id: I3ffdcd8ccad2c663732f8d5983049c837de00fe5

1 files changed, 8 insertions, 0 deletions

diff --git a/apps/gui/skin_engine/skin_render.c b/apps/gui/skin_engine/skin_render.c
index 80d8c83d27..965d785233 100644
--- a/apps/gui/skin_engine/skin_render.c
+++ b/apps/gui/skin_engine/skin_render.c
@@ -29,6 +29,7 @@
 #include "config.h"
 #include "core_alloc.h"
 #include "kernel.h"
+#include "appevents.h"
 #ifdef HAVE_ALBUMART
 #include "albumart.h"
 #endif
@@ -859,6 +860,13 @@ void skin_render(struct gui_wps *gwps, unsigned refresh_mode)
     display->set_framebuffer(NULL);
     skin_backdrop_show(data->backdrop_id);
 #endif
+
+    if (((refresh_mode&SKIN_REFRESH_ALL) == SKIN_REFRESH_ALL))
+    {
+        /* If this is the UI viewport then let the UI know
+         * to redraw itself */
+        send_event(GUI_EVENT_NEED_UI_UPDATE, NULL);
+    }
     /* Restore the default viewport */
     display->set_viewport(NULL);
     display->update();