Fix clearing highlighted yank in editors within modal dialogs #871
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This PR fixes a modality issue with the timer to clear the highlighted yank extension's highlights. If the editor was hosted inside a modal dialog (e.g. Live Templates in Settings), or shown from a modal dialog (e.g. Resolve Conflicts dialog), then the timer callback would wait for the modal dialog to close before clearing the highlights. This fixes VIM-2236.
These changes also fix some other minor issues with the highlighted yank extension:
g:highlightedyank_highlight_duration
can be a number as well as a string, matching the original Vim plugin.