Merge pull request #1099 from Elv13/fix_1091

Closes https://github.com/awesomeWM/awesome/pull/1099.
Fixes https://github.com/awesomeWM/awesome/issues/1091.

awesomerc.lua

@@ -428,6 +428,7 @@ awful.rules.rules = {
                      raise = true,
                      keys = clientkeys,
                      buttons = clientbuttons,
+                     screen = awful.screen.preferred,
                      placement = awful.placement.no_overlap+awful.placement.no_offscreen
      }
     },

lib/awful/screen.lua

@@ -12,7 +12,8 @@ local capi =
 {
     mouse = mouse,
     screen = screen,
-    client = client
+    client = client,
+    awesome = awesome,
 }
 local util = require("awful.util")
 local object = require("gears.object")
@@ -213,6 +214,17 @@ function screen.object.set_padding(self, padding)
     end
 end
 
+--- Get the preferred screen in the context of a client.
+-- This is exactly the same as `awful.screen.focused` except that it avoids
+-- clients being moved when Awesome is restarted.
+-- This is used in the default `rc.lua` to ensure clients get assigned to the
+-- focused screen by default.
+-- @tparam client c A client.
+-- @treturn screen The preferred screen.
+function screen.preferred(c)
+    return capi.awesome.startup and c.screen or screen.focused()
+end
+
 --- The defaults arguments for `awful.screen.focused`
 -- @tfield[opt=nil] table awful.screen.default_focused_args