Add data attribute support to button and other widgets (#7769)

* Add data attribute support to button widget

* Fix typo

* Refactor ready for making mechanism more generic

* Apply more generic implementation to multiplate widgets

* Refactor to use existing widget.assignAttributes() method

* Fix typo

* Clarify docs

* Update docs

* Update select widget to support style.* attributes

* Remove obsolete comment

* Fixes refresh issues for checkbox and links widgets for data attributes (#7846)

* fix: refresh issues with checkbox and links widgets

* fix: indenting

* Feat: add support for data attributes to Draggable and Droppable widgets (#7845)

* Docs clarification

* docs: add style and data attributes to Draggable and Droppable widget docs (#7850)

* Refactors Select widget to directly create DOM node (#7848)

* fix: refactored SelectWidget to directly create DOM nodes

* fix: refactored SelectWidget to directly create DOM nodes

* fix: improve refresh handling for select widget

* Fixes issues in the PR "Button widget data attributes" (#7852)

* fix: fixed ordered attributes handling and improved tests to catch event attributes

* fix: clean up code from testing

* fix: more tests and refactoring

* fix: use lowercase when checking for event attribute prefix

* fix: use lowercase when checking for event attribute prefix

* fix: changed comment wording

* fix: minor refactoring

* refactor: for brevity

---------

Co-authored-by: Saq Imtiaz <saq.imtiaz@gmail.com>

core/modules/widgets/range.js

@@ -50,6 +50,10 @@ RangeWidget.prototype.render = function(parent,nextSibling) {
 		this.inputDomNode.setAttribute("disabled",true);
 	}
 	this.inputDomNode.value = this.getValue();
+	this.assignAttributes(this.inputDomNode,{
+		sourcePrefix: "data-",
+		destPrefix: "data-"
+	});
 	// Add a click event handler
 	$tw.utils.addEventListeners(this.inputDomNode,[
 		{name:"mousedown", handlerObject:this, handlerMethod:"handleMouseDownEvent"},