Debugger option to select from only FORTRAN source files

When starting the debugger, we have to select a source file from a long list in order to set breakpoints.
Would it be possible to implement an option enabling us to do for one or more of these
- exclude C and assembler source files from the list
- filter the files listed by type, defaulting to [.for .f .f90 .f95 .f77 .mod .inc]
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John