Purpose

Based on #15759

The PR optimizes the way we load recent files, earlier we used to refresh the complete list of recent files, when launching dynamo, and then again when opening a graph, this was mainly done to fetch graph properties like thumbnail, description etc., to be displayed on the start page.
The optimization include handling events such as:

• Opening a new file, which also adds it to the recent files will now not refresh the complete list, deserialize and add only the new item.
• In case when adding to the list, increase the size of the recent files list beyond the maximum allowed recent files, it will trigger another refresh of the complete list, which is not mitigated by only removing the affected item from the list.
• When an existing item is selected from the recent files list, simply move the location of that item, to the start of the list, instead of yet again refreshing the complete list.

There was another part of the PR by Reope, that deals with deserialization optimization for graphs, it will be addressed in a separate PR, as that requires more discussion.

Results:

Results depend on the user's list of recent files, if the user has bigger files it will take longer. For this example I tested with 5 big and 5 "normal" size files.

(Total Time: 1721ms)
Before:
Action: Load Dynamo and Open any graph - Total time x2
Action: Load Dynamo and Open any graph (when recent files list at max items) - Total time x3

After:
Action: Load Dynamo and Open any graph - Total time x1
Action: Load Dynamo and Open any graph (when recent files list at max items) - Total time x1

Declarations

Check these if you believe they are true

• The codebase is in a better state after this PR
• Is documented according to the standards
• The level of testing this PR includes is appropriate
• User facing strings, if any, are extracted into *.resx files
• All tests pass using the self-service CI.
• Snapshot of UI changes, if any.
• Changes to the API follow Semantic Versioning and are documented in the API Changes document.
• This PR modifies some build requirements and the readme is updated
• This PR contains no files larger than 50 MB

Release Notes

• Optimize AddToRecent files working

Reviewers

@DynamoDS/eidos