Only close preview when editor gains focus

Closes #193

src/packages/markdown-preview/spec/markdown-preview-spec.coffee

@@ -7,8 +7,6 @@ describe "MarkdownPreview", ->
 
   beforeEach ->
     rootView = new RootView(require.resolve('fixtures/markdown'))
-    atom.loadPackage("markdown-preview").getInstance()
-    markdownPreview = MarkdownPreview.instance
 
   afterEach ->
     rootView.deactivate()
@@ -17,6 +15,7 @@ describe "MarkdownPreview", ->
     it "toggles on/off a preview for a .md file", ->
       rootView.open('file.md')
       editor = rootView.getActiveEditor()
+      markdownPreview = atom.loadPackage("markdown-preview").getInstance()
       expect(rootView.find('.markdown-preview')).not.toExist()
       spyOn(markdownPreview, 'loadHtml')
       editor.trigger('markdown-preview:toggle')
@@ -30,6 +29,7 @@ describe "MarkdownPreview", ->
     it "displays a preview for a .markdown file", ->
       rootView.open('file.markdown')
       editor = rootView.getActiveEditor()
+      markdownPreview = atom.loadPackage("markdown-preview").getInstance()
       expect(rootView.find('.markdown-preview')).not.toExist()
       spyOn(markdownPreview, 'loadHtml')
       editor.trigger('markdown-preview:toggle')
@@ -39,6 +39,7 @@ describe "MarkdownPreview", ->
     it "does not display a preview for non-markdown file", ->
       rootView.open('file.js')
       editor = rootView.getActiveEditor()
+      markdownPreview = atom.loadPackage("markdown-preview").getInstance()
       expect(rootView.find('.markdown-preview')).not.toExist()
       spyOn(markdownPreview, 'loadHtml')
       editor.trigger('markdown-preview:toggle')
@@ -49,6 +50,7 @@ describe "MarkdownPreview", ->
      it "removes markdown preview", ->
        rootView.open('file.md')
        editor = rootView.getActiveEditor()
+       markdownPreview = atom.loadPackage("markdown-preview").getInstance()
        expect(rootView.find('.markdown-preview')).not.toExist()
        spyOn(markdownPreview, 'loadHtml')
        editor.trigger('markdown-preview:toggle')
@@ -58,15 +60,16 @@ describe "MarkdownPreview", ->
        markdownPreviewView.trigger('core:cancel')
        expect(rootView.find('.markdown-preview')).not.toExist()
 
-   describe "when focus is lost", ->
+   describe "when the editor receives focus", ->
      it "removes the markdown preview view", ->
        rootView.open('file.md')
        editor = rootView.getActiveEditor()
+       markdownPreview = atom.loadPackage("markdown-preview").getInstance()
        expect(rootView.find('.markdown-preview')).not.toExist()
        spyOn(markdownPreview, 'loadHtml')
        editor.trigger('markdown-preview:toggle')
 
        markdownPreviewView = rootView.find('.markdown-preview')
        expect(markdownPreviewView).toExist()
-       markdownPreviewView.blur()
+       editor.focus()
        expect(rootView.find('.markdown-preview')).not.toExist()

src/packages/markdown-preview/src/markdown-preview-view.coffee

@@ -15,8 +15,9 @@ class MarkdownPreviewView extends ScrollView
   initialize: (@rootView) ->
     super
 
+    @editor = @rootView.getActiveEditor()
+    @subscribe @editor, 'focus', => @detach() unless @detaching
     @command 'core:cancel', => @detach() unless @detaching
-    @on 'focusout', => @detach() unless @detaching
 
   toggle: ->
     if @hasParent()
@@ -38,10 +39,10 @@ class MarkdownPreviewView extends ScrollView
     @detaching = false
 
   getActivePath: ->
-    @rootView.getActiveEditor()?.getPath()
+    @editor.getPath()
 
   getActiveText: ->
-    @rootView.getActiveEditor()?.getText()
+    @editor.getText()
 
   getErrorHtml: (error) ->
     $$$ ->