Slight cleanup of error handling based on improvement to pure-x11.

Gemfile

@@ -2,4 +2,5 @@
 
 source "https://rubygems.org"
 
-gem "pure-x11"
+gem "pure-x11", ">=0.0.9"
+

rubywm.rb

@@ -57,5 +57,9 @@ loop do
   end
 
   p ev
+  begin
     d.(ev.class, ev)
+  rescue X11::Error => e
+    pp e
+  end
 end

wm.rb

@@ -115,7 +115,7 @@ class WindowManager
     w = @windows[wid] # To avoid infinite recursion, this *must not* use #window
     return w if w
     w = Window.new(self, wid)
-    begin
+
     # FIXME: At least some of these ought to "adopted" but set as
     # floating/non-layout so they stay on a single desktop.
     #
@@ -140,7 +140,7 @@ class WindowManager
     return w if attr.override_redirect
     w.mapped = attr.map_state != 0
     geom = w.get_geometry
-      return w if geom.is_a?(X11::Form::Error) || geom.width < 2 || geom.height < 2
+    return w if geom.width < 2 || geom.height < 2
     @windows[wid] = w
 
     wms = w.get_property(:_NET_WM_STATE, :atom)&.value
@@ -160,11 +160,6 @@ class WindowManager
       X11::Form::EnterWindowMask     |
       X11::Form::LeaveWindowMask
     )
-    rescue Exception => e
-      p [:ZZZZZZZZZZZZZZZZZZZZZZZZZADOPT_FAILED, e]
-      # Failure here most likely reflects a window that has "disappeared".
-      # We should handle that better, but for now this is fine
-    end
     update_client_list
     return w
   end