cmd/govim: place signs for existing diagnostics in new buffers #590
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If gopls report diagnostics for files that aren't opened in vim
they won't get any signs placed when they are opened.
A typical use case is when staticcheck report diagnostics for
a file that isn't opened, and the user uses quickfix to jump
directly to the issue (effectively opening a new buffer).
This change updates the internal diagnostics cache when a buffer
is read or closed so existing diagnostics will have signs placed.