Investigate use of Editor Snapshots to improve performance

[mrlacey]

Look to improve performance when updating the UI through the use of snapshots.
See https://docs.microsoft.com/en-us/visualstudio/extensibility/inside-the-editor?view=vs-2017#a-closer-look-at-the-text-model-and-the-text-view

Also various entries in https://github.com/Microsoft/VSSDK-Extensibility-Samples/

[mrlacey]

Also, investigate using e.NewOrReformattedLines in ResourceAdornmentManager.LayoutChangedHandler
rather than iterating through all lines every time.

[MagicAndre1981]

As the extension fails to load in VS2017 (see #39 ), I tried it in VS2019 and here I get perf warnings

is this related to this issue?

[mrlacey]

As the extension fails to load in VS2017 (see #39 ), I tried it in VS2019 and here I get perf warnings

is this related to this issue?

It's possibly related. I haven't been able to track down the cause of the perf warning.

[mrlacey]

Sorry for the delayed response. Recent illness has stopped me from working on anything but I hope to get to this eventually.

[MagicAndre1981]

Sorry for the delayed response. Recent illness has stopped me from working on anything but I hope to get to this eventually.

ok, hope you get well soon