power: Don't hint if previous duration covers current duration

Don't hint if previous duration covers current duration, since new short
boost may interrupt previous long boost

Partially revert commit I977e844935539a4598a749c77f4c0934ca93a2b7 (power: Ignore
interaction boost sequence in a short period)

Change-Id: Ia2c824683ab148b2bf4d2859cb58e5c2721abe8d
diff --git a/power-common.c b/power-common.c
index 604c551..533df83 100644
--- a/power-common.c
+++ b/power-common.c
@@ -66,6 +66,7 @@
 
 void process_interaction_hint(void* data) {
     static struct timespec s_previous_boost_timespec;
+    static int s_previous_duration = 0;
     static int prev_interaction_handle = -1;
 
     struct timespec cur_boost_timespec;
@@ -89,7 +90,12 @@
     if (elapsed_time < 250000 && duration <= kMinInteractiveDuration) {
         return;
     }
+    // also don't hint if previous hint's duration covers this hint's duration
+    if ((s_previous_duration * 1000) > (elapsed_time + duration * 1000)) {
+        return;
+    }
     s_previous_boost_timespec = cur_boost_timespec;
+    s_previous_duration = duration;
 
     int interaction_handle =
             perf_hint_enable_with_type(VENDOR_HINT_SCROLL_BOOST, duration, SCROLL_VERTICAL);