Toolbar: Sorts our proper destroy methods for toolbar and fixedtoolbar

Fixes gh-6987
Fixes gh-6939
Closes gh-7252

(cherry picked from commit 3efe6fedad0f5f259d8616f0c753a22fe5595fb6)
Slider: change event is too greedy with mouse drag

Fixes gh-7649
Closes gh-7653

(cherry picked from commit 32f471c3e67357975fe310bbae4cf7a8f7b3bab4)