unpaid sanity_check: leaving shop via recoil

Throwing while levitating or getting hit for knockback effect could
move hero carrying unpaid items out of a shop.  If that happened,
sanity_check complained that unpaid items weren't in a tended shop.

Check for entering and leaving special rooms during recoil same as
gets done for ordinary movement.  Leaving a shop via recoil or
knockback while owing a bill now gets treated as robbery immediately
rather than waiting until hero voluntarily moves to another spot
after recoil has finished.

doc/fixes3-7-0.txt

@@ -1065,6 +1065,9 @@ map browsing during gold detection didn't describe fake gold marking traps
 if hero's action caused engulfer to expel swallowed hero, it might do so onto
 	a level teleporter and then have its memory accessed after being
 	freed when current level was saved in order to load destination level
+throwing recoil while levitating could send hero out of shop while carrying
+	unpaid items, triggering sanity check warnings; once outside, taking
+	a step other than back into the shop was treated as a robbery
 
 
 Fixes to 3.7.0-x Problems that Were Exposed Via git Repository
@@ -1435,6 +1438,9 @@ the #saveoptions command included options changed via doset_simple() but not
 fix 'nethack --scores' as alias for 'nethack -s'
 adding command line 'nethack --usage' broke 'nethack -u name' (however,
 	'nethack -uname' still worked for names other than "sage")
+being hit by a big monster and getting knockback effect could send hero out
+	of a shop (or into its "free spot") while carrying unpaid goods;
+	robbery wasn't noticed until hero eventually moved to a different spot
 
 curses: 'msg_window' option wasn't functional for curses unless the binary
 	also included tty support

src/dothrow.c

@@ -917,6 +917,10 @@ hurtle_step(genericptr_t arg, coordxy x, coordxy y)
     if (levl[u.ux][u.uy].typ != levl[ox][oy].typ)
         switch_terrain();
 
+    /* might be entering a special room (treasure zoo, thrown room, &c) that
+       has a first-time entry message, or leaving shop with unpaid goods */
+    check_special_room(FALSE);
+
     if (is_pool(x, y) && !u.uinwater) {
         if ((Is_waterlevel(&u.uz) && is_waterwall(x,y))
             || !(Levitation || Flying || Wwalking)) {