touchscreen: Fix kinetic scrolling when the statusbar is off.

The scrolling code cannot differentiate between the BUTTON_TOUCHSCREEN post
from normal touches and the one posted in the timeout callback.

To fix introduce a global special button (BUTTON_REDRAW) that results
in the desired redraw. This existed already as a local kludge for android
and is now generalized.

Change-Id: I6bfa6c66431c48f5042fcd8fce2ea72cd3457f58

1 files changed, 4 insertions, 0 deletions

diff --git a/apps/action.c b/apps/action.c
index ee6cbaa4cf..5ebcbf771b 100644
--- a/apps/action.c
+++ b/apps/action.c
@@ -233,6 +233,10 @@ static int get_action_worker(int context, int timeout,
      * multimedia button presses don't go through the action system */
     if (button == BUTTON_NONE || button & (SYS_EVENT|BUTTON_MULTIMEDIA))
         return button;
+    /* the special redraw button should result in a screen refresh */
+    if (button == BUTTON_REDRAW)
+        return ACTION_REDRAW;
+
     /* Don't send any buttons through untill we see the release event */
     if (wait_for_release)
     {