[analysis_server] Fix moving classes to existing files that have directives Previously when moving to an existing file, the moved declarations would be put at offset 0, regardless of whether there are existing directives. This change causes new items to always be added at the end of the file instead (+ adds some tests for handling moving between parts). Change-Id: Ie3e218a8c5ebf24cc680d576a0f852661fc42c29 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/291240 Commit-Queue: Brian Wilkerson <brianwilkerson@google.com> Reviewed-by: Brian Wilkerson <brianwilkerson@google.com>
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