Looks like the recent change to allow editing pretty-printed resources has an unintended side effect here.
Updated the title to be clearer. Breakpoints in auto-formatted JS resources are not working, because the formatterSourceMap is getting cleared. The file appears as if it is not pretty-printed, even though it is.
<rdar://problem/15365257>
Created attachment 215683 [details] [PATCH] Proposed Fix
STEPS TO REPRODUCE: 1. Inspect <http://bogojoker.com/shell/> 2. Select easySlider.min.js in resource sidebar => file should auto format, pretty print button should be blue, breakpoints should work past line 4.
Comment on attachment 215683 [details] [PATCH] Proposed Fix Clearing flags on attachment: 215683 Committed r158404: <http://trac.webkit.org/changeset/158404>
All reviewed patches have been landed. Closing bug.