Reduce updating triggers for displays

[hoxbro]

This will now only update the data of the display each time a refresh() is done and only refresh when selected_indexes is changed.

Something like this would run self.annotator.get_dataframe 5 times with each click on a curve. If I commented out the anno2 line, it would be 3 times. After this change, it will only run once, and not update when clicking (as the data has not changed).

from __future__ import annotations

import holoviews as hv
import panel as pn

from holonote.annotate import Annotator, SQLiteDB
from holonote.app import PanelWidgets

hv.extension("bokeh")

# connector = SQLiteDB(filename=":memory:")
connector = SQLiteDB(table_name="test_curves")

annotator = Annotator({"TIME": float}, fields=["description"], connector=connector)
anno1 = annotator * hv.Curve(range(10), kdims="TIME")
anno2 = annotator * hv.Curve(range(10)[::-1], kdims="TIME")
anno = anno1

b = PanelWidgets(annotator)
pn.Row(b, anno).servable()