Displaying only one tooltip when using the HoverTool() tool
问题 I am plotting very many points in Bokeh, and I have added the HoverTool to the list of tools of the figure, so that the mouse shows the x,y coordinates of the mouse when close to a glyph. When the mouse gets close to a set of glyphs closely packed together, I get as many tooltips as glyphs. I want instead only one tooltip, the one of the closest glyph. This isn't just a presentation detail, because for very many points this results: in slow interaction with the plot, with the browser getting