fix focus when starting up, especially when replacing another instance of openbox

adds a function event_reset_time() that forces event_time() to look for a new (future) timestamp

openbox/event.c

@@ -98,13 +98,13 @@ static gboolean focus_delay_func(gpointer data);
 static gboolean unfocus_delay_func(gpointer data);
 static void focus_delay_client_dest(ObClient *client, gpointer data);
 
-Time event_last_user_time;
+Time event_last_user_time = CurrentTime;
 
 /*! The time of the current X event (if it had a timestamp) */
-static Time event_curtime;
+static Time event_curtime = CurrentTime;
 /*! The source time that started the current X event (user-provided, so not
   to be trusted) */
-static Time event_sourcetime;
+static Time event_sourcetime = CurrentTime;
 
 /*! The serial of the current X event */
 static gulong event_curserial;
@@ -146,10 +146,6 @@ void event_startup(gboolean reconfig)
 #endif
 
     client_add_destroy_notify(focus_delay_client_dest, NULL);
-
-    event_curtime = CurrentTime;
-    event_sourcetime = CurrentTime;
-    event_last_user_time = CurrentTime;
 }
 
 void event_shutdown(gboolean reconfig)
@@ -2210,7 +2206,7 @@ gboolean event_time_after(guint32 t1, guint32 t2)
 gboolean find_timestamp(XEvent *e, gpointer data)
 {
     const Time t = event_get_timestamp(e);
-    if (t != CurrentTime) {
+    if (t > event_curtime) {
         event_curtime = t;
         return TRUE;
     }
@@ -2218,10 +2214,8 @@ gboolean find_timestamp(XEvent *e, gpointer data)
         return FALSE;
 }
 
-Time event_time(void)
+static Time next_time(void)
 {
-    if (event_curtime) return event_curtime;
-
     /* Some events don't come with timestamps :(
        ...but we can get one anyways >:) */
 
@@ -2240,7 +2234,19 @@ Time event_time(void)
     return event_curtime;
 }
 
+Time event_time(void)
+{
+    if (event_curtime) return event_curtime;
+
+    return next_time();
+}
+
 Time event_source_time(void)
 {
     return event_sourcetime;
 }
+
+void event_reset_time(void)
+{
+    next_time();
+}

openbox/event.h

@@ -68,6 +68,11 @@ gboolean event_time_after(guint32 t1, guint32 t2);
   is a time at or after it, but at or before any other events we will process
 */
 Time event_time(void);
+
+/*! Force event_time() to skip the current timestamp and look for the next
+  one. */
+void event_reset_time(void);
+
 /*! A time at which an event happened that caused this current event to be
   generated.  This is a user-provided time and not to be trusted.
   Returns CurrentTime if there was no source time provided.

openbox/openbox.c

@@ -213,6 +213,11 @@ gint main(gint argc, gchar **argv)
                                                XC_top_left_corner);
 
     if (screen_annex()) { /* it will be ours! */
+
+        /* get a timestamp from after taking over as the WM.  if we use the
+           old timestamp to set focus it can fail when replacing another WM. */
+        event_reset_time();
+
         do {
             ObPrompt *xmlprompt = NULL;
 
@@ -317,7 +322,6 @@ gint main(gint argc, gchar **argv)
 
                 /* get all the existing windows */
                 window_manage_all();
-                focus_nothing();
 
                 /* focus what was focused if a wm was already running */
                 if (OBT_PROP_GET32(obt_root(ob_screen),