Tests that breakpoints appear correct in the sidebar pane.
Script source was shown.
Set first breakpoint.
Breakpoint sidebar pane
a.js:18 return a + b;
Set second breakpoint on the same line.
Breakpoint sidebar pane
a.js:18:3return a + b;
a.js:18:16
Set a third breakpoint on a different line.
Breakpoint sidebar pane
a.js:17 b = b / 2;
a.js:18:3return a + b;
a.js:18:16