always center the mouse on the primary screen at startup

This ensures the user knows where the mouse is

capi.lua

@@ -35,6 +35,7 @@ local boolean = false ---@type boolean
 local string = "" ---@type string
 ---@alias screen AwesomeScreenInstance|integer
 ---@alias AwesomeGeometry { height: number, width: number, x: number, y: number }
+---@alias AwesomePosition { x: number,  y: number }
 ---@alias AwesomeLayout { arrange: function, name: string, skip_gap: function, arrange: function?}
 ---@alias CairoPattern userdata
 ---@alias exit_callback fun(type: "signal"|"exit", code: integer)
@@ -244,8 +245,10 @@ function types.AwesomeRoot:__newindex(k, v) end
 ---@class AwesomeKeygrabber
 ---@class AwesomeMousegrabber
 ---@class AwesomeMouse
+---@field coords fun(coords_table?: AwesomePosition, silent?: boolean): {[integer]: boolean, x: number, y: number}
 ---@field screen AwesomeScreenInstance
 ---@field current_wibox table? wibox
+
 ---@class AwesomeScreen :AwesomeSignalClass
 ---@field primary AwesomeScreenInstance?
 ---@field [integer] AwesomeScreenInstance?

rc.lua

@@ -105,3 +105,12 @@ _G.collectgarbagetimer = require("gears.timer").new({
   autostart = true,
   callback = require("util.bind").with_args(collectgarbage, "collect"),
 })
+
+local primary = capi.screen.primary
+if primary then
+  require("awful.screen").focus(primary)
+  capi.mouse.coords({
+    x = primary.geometry.width / 2,
+    y = primary.geometry.height / 2,
+  }, true)
+end