does not stop slide show if switch to thumbnail view from slideshow mode

does not stop slide show if switch to thumbnail view from slideshow mode by clicking photo tab on left side.

but it can stop slide show by clicking switch button on toolbar to switch to thumbnail.

steps:
 1.launch photo mode
 2.switch to single photo view
 3.click play button to slide show
 4.click photo tab on left side,it will switch to thumbnail view
 5.then you see slide show is going on and the selection indicator move from one picture to next one
 6.there is no direct way to stop slide show under this view.
 7.you have to double click selected picture to switch single photo view, then click switch button on toolbar to stop slide show.

current result:
 can't stop slide show if switch to thumbnail with clicking thumbnail tab.

expected result:
 stop slide show when switch to thumbnail no matter what way.