Incomplete context on unchanged diff file line discussions

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If you expand diff file on a merge request and then comment on expanded lines you'll see that the provided diff context is limited by 4 lines only. Also, this context window ends on a bottom line, which is not expected (the first lines are the most important ones usually). To fix this we should:

1. Always show the first selected line in the context window
2. (potentially) increase the window size from 4 lines max
3. If increasing context window is not possible provide options to see the full selection (maybe via a link)

Below are examples of the context window, each comment was started on the same line and progressively increased the amount of lines selected.

Selected lines	Context window
1
2
3
4
5
6