scratchpad: fix crash when moving last window of an invisible workspace (+test) (Thanks bafain)

It looks like the code which was removed with this commit was not
necessary anyways since con_move_to_workspace() by now checks on its own
whether it moves to the scratchpad.

fixes #913

src/scratchpad.c

@@ -4,7 +4,7 @@
  * vim:ts=4:sw=4:expandtab
  *
  * i3 - an improved dynamic tiling window manager
- * © 2009-2011 Michael Stapelberg and contributors (see also: LICENSE)
+ * © 2009-2013 Michael Stapelberg and contributors (see also: LICENSE)
  *
  * scratchpad.c: Moving windows to the scratchpad and making them visible again.
  *
@@ -53,7 +53,6 @@ void scratchpad_move(Con *con) {
 
     /* 2: Send the window to the __i3_scratch workspace, mainting its
      * coordinates and not warping the pointer. */
-    Con *focus_next = con_next_focused(con);
     con_move_to_workspace(con, __i3_scratch, true, true);
 
     /* 3: If this is the first time this window is used as a scratchpad, we set
@@ -63,11 +62,6 @@ void scratchpad_move(Con *con) {
         DLOG("This window was never used as a scratchpad before.\n");
         con->scratchpad_state = SCRATCHPAD_FRESH;
     }
-
-    /* 4: Fix focus. Normally, when moving a window to a different output, the
-     * destination output gets focused. In this case, we don’t want that. */
-    if (con_get_workspace(focus_next) == con_get_workspace(focused))
-        con_focus(focus_next);
 }
 
 /*

testcases/t/204-regress-scratchpad-move.t

@@ -0,0 +1,65 @@
+#!perl
+# vim:ts=4:sw=4:expandtab
+#
+# Please read the following documents before working on tests:
+# • http://build.i3wm.org/docs/testsuite.html
+#   (or docs/testsuite)
+#
+# • http://build.i3wm.org/docs/lib-i3test.html
+#   (alternatively: perldoc ./testcases/lib/i3test.pm)
+#
+# • http://build.i3wm.org/docs/ipc.html
+#   (or docs/ipc)
+#
+# • http://onyxneon.com/books/modern_perl/modern_perl_a4.pdf
+#   (unless you are already familiar with Perl)
+#
+# Moves the last window of a workspace to the scratchpad. The workspace will be
+# cleaned up and previously, the subsequent focusing of a destroyed container
+# would crash i3.
+# Ticket: #913
+# Bug still in: 4.4-97-gf767ac3
+use i3test;
+use X11::XCB qw(:all);
+
+# TODO: move to X11::XCB
+sub set_wm_class {
+    my ($id, $class, $instance) = @_;
+
+    # Add a _NET_WM_STRUT_PARTIAL hint
+    my $atomname = $x->atom(name => 'WM_CLASS');
+    my $atomtype = $x->atom(name => 'STRING');
+
+    $x->change_property(
+        PROP_MODE_REPLACE,
+        $id,
+        $atomname->id,
+        $atomtype->id,
+        8,
+        length($class) + length($instance) + 2,
+        "$instance\x00$class\x00"
+    );
+}
+
+sub open_special {
+    my %args = @_;
+    my $wm_class = delete($args{wm_class}) || 'special';
+
+    return open_window(
+        %args,
+        before_map => sub { set_wm_class($_->id, $wm_class, $wm_class) },
+    );
+}
+
+my $tmp = fresh_workspace;
+
+# Open a new window which we can identify later on based on its WM_CLASS.
+my $scratch = open_special;
+
+my $tmp2 = fresh_workspace;
+
+cmd '[class="special"] move scratchpad';
+
+does_i3_live;
+
+done_testing;