Fix: Force start_line for jumping to diagnostic to be inside buffer #494
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There could be an error when jumping to a diagnostic that was placed on a line range and some lines in that range were removed so that the start line of the diagnostic ended up outside of the buffer (e.g., line number -2).
The same bug was also responsible for diagnostics to be placed outside of buffer which was causing a full screen of errors.
Additionally, in this MR, diagnostics are not processed unnecessarily for Diffview NULL buffers (for deleted and added files).