Fix/draggable only when can drag (#3187)

* check monitor for draggable

* versioning strategy with patch on changed repo and declined on all others

* fix: use string type for setting html attribute

* fix: always set the draggable attribute on connectDragSource

* fix: update semver doc

Co-authored-by: Chris Trevino <chtrevin@microsoft.com>

.yarn/versions/cc76e3dc.yml

@@ -0,0 +1,7 @@
+releases:
+  react-dnd-html5-backend: patch
+
+declined:
+  - react-dnd-documentation
+  - react-dnd-examples
+  - react-dnd-test-utils

packages/backend-html5/src/HTML5BackendImpl.ts

@@ -149,7 +149,7 @@ export class HTML5BackendImpl implements Backend {
 		const handleDragStart = (e: any) => this.handleDragStart(e, sourceId)
 		const handleSelectStart = (e: any) => this.handleSelectStart(e)
 
-		node.setAttribute('draggable', 'true')
+		node.setAttribute('draggable', '' + this.monitor.canDragSource(sourceId))
 		node.addEventListener('dragstart', handleDragStart)
 		node.addEventListener('selectstart', handleSelectStart)