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When select text on content (many words or many lines), the sidebar closes
it happens even in the demo:
https://ej2.syncfusion.com/angular/demos/sidebar/responsive-panel/
in order to see the effect, you must select text moving the mouse to the top-left direction, if you move other way it doesn't happend.
NOTE: It also happen when you move the mouse right-to-left, while the mouse is clicked down

