Extract timeout constant

services/web/public/coffee/ide/pdf/controllers/PdfController.coffee

@@ -5,6 +5,8 @@ define [
 	"libs/bib-log-parser"
 	"services/log-hints-feedback"
 ], (App, Ace, HumanReadableLogs, BibLogParser) ->
+	AUTO_COMPILE_TIMEOUT = 3000
+
 	App.controller "PdfController", ($scope, $http, ide, $modal, synctex, event_tracking, logHintsFeedback, localStorage) ->
 		# enable per-user containers by default
 		perUserCompile = true
@@ -79,7 +81,7 @@ define [
 		autoCompileListener = null
 		toggleAutoCompile = (enabling) ->
 			if enabling
-				autoCompileListener = ide.$scope.$on "ide:opAcknowledged", _.debounce(triggerAutoCompile, 3000)
+				autoCompileListener = ide.$scope.$on "ide:opAcknowledged", _.debounce(triggerAutoCompile, AUTO_COMPILE_TIMEOUT)
 			else
 				autoCompileListener() if autoCompileListener
 				autoCompileListener = null