Allow rerunning the search after window focus

The files being searched may have changed due to modifications
done outside of Atom.

Closes #169

lib/project-find-view.coffee

@@ -47,6 +47,7 @@ class ProjectFindView extends View
     @findHistory = new History(@findEditor, findHistory)
     @replaceHistory = new History(@replaceEditor, replaceHistory)
     @pathsHistory = new History(@pathsEditor, pathsHistory)
+    @onlyRunIfChanged = true
 
     @regexOptionButton.addClass('selected') if @model.useRegex
     @caseOptionButton.addClass('selected') if @model.caseSensitive
@@ -91,6 +92,8 @@ class ProjectFindView extends View
     @subscribe @model, 'replacement-state-cleared', (results) => @generateResultsMessage(results)
     @subscribe @model, 'finished-searching', (results) => @generateResultsMessage(results)
 
+    @subscribe $(window), 'focus', => @onlyRunIfChanged = false
+
     atom.workspaceView.command 'find-and-replace:use-selection-as-find-pattern', @setSelectionAsFindPattern
 
     @handleEventsForReplace()
@@ -158,7 +161,9 @@ class ProjectFindView extends View
     @replaceHistory.store()
     @pathsHistory.store()
 
-    @search(onlyRunIfChanged: true)
+    searchPromise = @search({@onlyRunIfChanged})
+    @onlyRunIfChanged = true
+    searchPromise
 
   search: ({onlyRunIfActive, onlyRunIfChanged}={}) ->
     return Q() if onlyRunIfActive and not @model.active

spec/project-find-view-spec.coffee

@@ -375,6 +375,40 @@ describe 'ProjectFindView', ->
           expect(atom.project.scan).not.toHaveBeenCalled()
           expect(projectFindView.model.clear).toHaveBeenCalled()
 
+      it "reruns the search when confirmed again after focusing the window", ->
+        projectFindView.findEditor.setText('thisdoesnotmatch')
+        projectFindView.trigger 'core:confirm'
+
+        waitsForPromise ->
+          searchPromise
+
+        runs ->
+          spyOn(atom.project, 'scan')
+          projectFindView.trigger 'core:confirm'
+
+        waitsForPromise ->
+          searchPromise
+
+        runs ->
+          expect(atom.project.scan).not.toHaveBeenCalled()
+          atom.project.scan.reset()
+          $(window).triggerHandler 'focus'
+          projectFindView.trigger 'core:confirm'
+
+        waitsForPromise ->
+          searchPromise
+
+        runs ->
+          expect(atom.project.scan).toHaveBeenCalled()
+          atom.project.scan.reset()
+          projectFindView.trigger 'core:confirm'
+
+        waitsForPromise ->
+          searchPromise
+
+        runs ->
+          expect(atom.project.scan).not.toHaveBeenCalled()
+
       describe "when results exist", ->
         beforeEach ->
           projectFindView.findEditor.setText('items')