Unminimize before checking for tag switch (FS#1020)

For a minimized client, c:isvisible() is always false which is not what we want
here. So instead, unminimize the client before checking if it's visible.

Signed-off-by: Uli Schlachter <psychon@znc.in>

awesomerc.lua.in

@@ -122,6 +122,9 @@ mytasklist.buttons = awful.util.table.join(
                                               if c == client.focus then
                                                   c.minimized = true
                                               else
+                                                  -- Without this, the following
+                                                  -- :isvisible() makes no sense
+                                                  c.minimized = false
                                                   if not c:isvisible() then
                                                       awful.tag.viewonly(c:tags()[1])
                                                   end