Inconsistent tabbing between text editor and preview-button in New Post view

[gish]

Behavior:

1) When the marker is placed in the editor field and the user presses the tab button, the next element selected is the "preview"-button. The "save draft"-button is skipped.

2) Tabbing backwards from "preview" (shift+tab), the "save draft" button is selected, hence inconsistency.

Expected behavior:

1) The select phase tabbing between editor field and "preview" button should be: Editor field <->"Save draft"<->"Preview"

[gish]

It's been tested in Google Chrome v23.0.1271.95 and Firefox v16.0.2

[adamsilverstein]

correct tabbing out of post edit area

[adamsilverstein]

i believe the attached patch corrects the issue

[SergeyBiryukov]

Related: #23195

[adamsilverstein]

attached patch same as for #23195, these two tickets need to be merged

[markjaquith]

In 23395:

Fix some tabbing issues on the post editing screen. Add Media no longer skipped when going backwards from content. Save Draft no longer skipped when going forwards from content.

props adamsilverstein. fixes #23195 and #22933