Window sticked to mouse + Text selection + Empty headers/params + JSON Formatter

I will notice some behaviors that i believe are not intentional and decide to make this report.

1. When the Yaak window is not in focus and you click on the Yaak window top bar and move the mouse quickly, the Yaak window gets "stuck" to the mouse as if you had the left mouse button pressed.

2. The selected text is not "cleared" if the click or new selection is outside the "sub window" in which the selection was made.

3. Shouldn't empty "Params" and "Headers" fields with nothing below be trimmed when switching tabs? Is this how it is done when enabling/disabling "bulk edit".

4. A feature that I believe would also be interesting would be to inform that the JSON contains a formatting error, or even format automatically (by adding the quotes) when clicking on "formatter".