Steps to reproduce:
- Go to https://www.mediawiki.org/w/index.php?diff=2285787&oldid=2285785&title=MediaWiki&diffmode=source
- Move the mouse pointer to the yellow line (or bar) right before the yellow knob
- Move the mouse pointer to the yellow knob
- Move the mouse pointer to the blue knob
- Move it to the blue line
- Move it to the empty area between the blue line and the slider button
- (Optional) Move the mouse pointer back to revision bars area.
Expected:
No console errors
Actual:
Uncaught TypeError: Cannot read property 'top' of undefined$.extend.showTooltipsOnMouseMoveHandler @ VM156:formatted:5849(anonymous function) @ VM156:formatted:5803jQuery.event.dispatch @ load.php?debug=false&lang=en&modules=jquery%2Cmediawiki|mediawiki.legacy.wikibits&only=scripts&skin…:65elemData.handle @ load.php?debug=false&lang=en&modules=jquery%2Cmediawiki|mediawiki.legacy.wikibits&only=scripts&skin…:60
This doesn't seem to cause have any immediate problem. It was simply something noticed while testing out the interface.