.triggerHandler doesn't return value from handler for DOM0 events

[onovy]

According to documentation (​http://api.jquery.com/triggerHandler/) .triggerHandler should return value returned by event handler:

Instead of returning the jQuery object (to allow chaining), .triggerHandler() returns whatever value was returned by the last handler it caused to be executed. If no handlers are triggered, it returns undefined.

But when you add event handler using DOM0 method (onXY attribute), .triggerHandler returns 'undefined' everytime. Doesn't matter what you return from handler function.

Tested in browsers: Chrome/Firefox
jQuery version: 1.10 / 1.10.1
Test case: ​http://jsbin.com/atofap/3/edit

In console is:
click1
undefined
click2
false

Should be:
click1
false
click2
false

[dmethvin]

We've never fully supported inline handers but this looks easy enough to fix. ​https://github.com/jquery/jquery/blob/8643ac77fbd7508651639a41eced5338c1738c12/src/event.js#L300

[dmethvin]

Landed at:

​https://github.com/jquery/jquery/commit/3bcd04f528597dac0a7084865461574ab4a06465 (master)

​https://github.com/jquery/jquery/commit/b7da3b00439f9217922544c644150cac7528ce5a (1.x-master)