Don't automatically switch focus back to a Dialog that is fading out.

Clicking "paste" in the Dialog from the PasteFromWord plugin switches focus
to the editor.  The code added in 49339a0685729c69df92e91138788a6b50cdf2ef was interpreting this
as an accidental focus change, and switching focus back to the dialog, thus
breaking the paste operation.  It was a race condition during the Dialog fade out.

Refs #15370, #16550, #17195.
remove unused dependency
remove unused dependency
remove unused dependency
Add README.md and CONTRIBUTING.md, refs #17189
Refs #17214.  Add check for for max==min to dijit Slider, and added automated tests.
update CSS so arrow doesn't show on toggleable=false Fieldset
fix text selection problem on IE9 in quirks mode, fixes #17216
thanks to neek for the investigation and patch
(cherry picked from commit c86c4ea8504875fa749fc096043907bdf90de1e5)
Fixes #17217.  Forward port [2876164aa20aff71392d37d3d492e30d4618c6b3/dijit] to trunk.