[issue2551065] Cannot add attributes to submit buttons

New submission from Garth Jensen:

Using tal:attributes with tal:replace="structure context/submit" 
doesn't actually add attributes to the resulting submit button.  This 
makes it impossible to style the button by adding a class attribute.  
The reason this happens is that context/submit returns two or three 
hidden inputs before the submit input.  The attributes assigned by 
tal:attributes get attached to the first (hidden) input instead of the 
submit input.  The fix is to make the submit input get returned first 
in the HTMLClass.submit and _HTMLItem.submit methods in templating.py.

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components: Web interface
messages: 6706
nosy: garth
severity: minor
status: new
title: Cannot add attributes to submit buttons
versions: 1.6.1

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<https://issues.roundup-tracker.org/issue2551065>
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