To reproduce:
1. Select some text
2. Do a quicklook event on a blank part of the page (3-finger tap)

Expected result: Nothing should happen (no text is under the tap)

Actual result: Dictionary.app opens

See attached video.

The Dictionary.app instance opens blank, which is  issue 830047 .

The reason that this happens is that we incorrectly interpret "we received no string from the renderer" to mean "we were incapable of getting a string-and-point, so fall back to using Dictionary.app on whatever the currently selected text is" at [1] (moving soon, search for this bug number to find the new source location).

Instead, we need to discriminate between the "we were able to successfully look for the string-and-point in the page, and there is none" situation and "we were unable to look for the string-and-point in the page, do a fallback for us".

[1] https://cs.chromium.org/chromium/src/content/browser/renderer_host/render_widget_host_view_cocoa.mm?rcl=426a021c6c1c9232c2f0fd5d56b10c9eef4887d4&l=894
 

Deleted: dictionary2.mov 1.1 MB

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