Cleanups as a result of just letting X11::Error exceptions mostly caused by closed windows now being handled at the top level

Some of these may possibly need to be reintroduced, but in most cases
bailing out from handling the current event is the right choice in any
case.

window.rb

@@ -17,7 +17,7 @@ class Window < X11::Window
     @wm = wm
     self.desktop = desktop
     @hidden = false
-    @realgeom = get_geometry rescue nil
+    @realgeom = get_geometry
     @floating = floating
 
     # This is a "safety" workaround
@@ -37,7 +37,7 @@ class Window < X11::Window
       resize_to_geom(@realgeom)
     end
 
-    (lower if desktop?) rescue nil
+    lower if desktop?
   end
 
   def mapped=(state)
@@ -52,8 +52,8 @@ class Window < X11::Window
   def hide
     return if @hidden
     @hidden=true
-    @realgeom = get_geometry rescue nil
-    resize_to_geom(@realgeom) if @realgeom
+    @realgeom = get_geometry
+    resize_to_geom(@realgeom)
   end
 
   def show
@@ -129,8 +129,7 @@ class Window < X11::Window
     return if special?
     rootgeom = @wm.rootgeom
 
-    geom = get_geometry rescue nil
-    return if geom.nil?
+    geom = get_geometry
 
     if (og = @old_geom) &&
       geom.x == 0 && geom.y == 0 &&

wm.rb

@@ -234,19 +234,15 @@ class WindowManager
   def on_button_press(ev)
     return if !ev.child
     w = window(ev.child)
-    @attr = w.get_geometry rescue nil
-    if @attr
-      set_focus(w.wid)
-      @start = ev
-    end
+    @attr = w.get_geometry
+    set_focus(w.wid)
+    @start = ev
   end
 
   def on_motion_notify(ev)
     # @start.button == 1 -> move
     # @start.button == 3 -> resize
-    if ev.child != @start.child
-      set_focus(ev.child) rescue nil # FIXME
-    end
+    set_focus(ev.child) if ev.child != @start.child
     return if !@start&.child || !@attr
 
     xdiff = ev.root_x - @start.root_x;
@@ -255,10 +251,7 @@ class WindowManager
     w = window(@start.child)
 
     # FIXME: Any other types we don't want to allow moving or resizing
-    begin
-      return if w.special?
-    rescue # FIXME: Why is this here?
-    end
+    return if w.special?
 
     if @start.detail == 1 # Move
       if w.floating?
@@ -397,10 +390,8 @@ class WindowManager
     dir = dpy.get_atom_name(dir).downcase.to_sym
 
     if @focus.floating?
-      # FIXME:
-      # Move stepwise instead.
-      g = @focus.get_geometry rescue nil
-      return if g.nil?
+      g = @focus.get_geometry
+
       case dir
       when :left  then @focus.configure(x: g.x - 20)
       when :right then @focus.configure(x: g.x + 20)