Add initial size to window options when opening urls

src/atom-application.coffee

@@ -130,8 +130,7 @@ class AtomApplication
     @on 'application:hide-other-applications', -> Menu.sendActionToFirstResponder('hideOtherApplications:')
     @on 'application:unhide-all-applications', -> Menu.sendActionToFirstResponder('unhideAllApplications:')
     @on 'application:new-window', ->
-      [width, height] = @focusedWindow()?.getSize() ? []
-      @openPath(initialSize: {width, height})
+      @openPath(initialSize: @getFocusedWindowSize())
     @on 'application:new-file', -> (@focusedWindow() ? this).openPath()
     @on 'application:open', -> @promptForPath()
     @on 'application:open-dev', -> @promptForPath(devMode: true)
@@ -197,6 +196,17 @@ class AtomApplication
   focusedWindow: ->
     _.find @windows, (atomWindow) -> atomWindow.isFocused()
 
+  # Public: Get the height and width of the focused window.
+  #
+  # Returns an object with height and width keys or null if there is no
+  # focused window.
+  getFocusedWindowSize: ->
+    if focusedWindow = @focusedWindow()
+      [width, height] = focusedWindow.getSize()
+      {width, height}
+    else
+      null
+
   # Public: Opens multiple paths, in existing windows if possible.
   #
   # * options
@@ -282,7 +292,7 @@ class AtomApplication
       if pack.urlMain
         packagePath = @packages.resolvePackagePath(packageName)
         bootstrapScript = path.resolve(packagePath, pack.urlMain)
-        new AtomWindow({bootstrapScript, @resourcePath, devMode, urlToOpen})
+        new AtomWindow({bootstrapScript, @resourcePath, devMode, urlToOpen, initialSize: getFocusedWindowSize()})
       else
         console.log "Package '#{pack.name}' does not have a url main: #{urlToOpen}"
     else