When you click the "+" button in the Breakpoints window to open a file so as to add a breakpoint, the existing breakpoints for the file aren't displayed after the file is loaded.

This has another consequence: if you click on the line number for an existing breakpoint (which isn't displayed), thinking there isn't a breakpoint there, the breakpoint will get removed.

The cause is that `BreakpointController-addBreakpoint:` sets the file for the `BSSourceView`, but doesn't then load the markers for the file. By contrast, if the file is loaded by clicking on a breakpoint in the NSTableView listing breakpoints, `BreakpointController-tableViewSelectionDidChange:` both sets the file and loads the markers.

Resolved via the re-design for 2.0.