Prevent Atom 1.17 docks from animating their toggle buttons

styles.less

/*
Choose Atom, Stylesheet... menu to add these to your local style overrides.
These styles only work on the .left and .bottom toggle buttons, but should
be straightforward to copy the .left selectors and adjust for other edges.
*/

.atom-dock-toggle-button:not(.atom-dock-toggle-button-visible) .icon {
  opacity: 1;
  transition: unset;
}
.atom-dock-toggle-button:not(.atom-dock-toggle-button-visible) .atom-dock-toggle-button-inner.left,
.atom-dock-toggle-button:not(.atom-dock-toggle-button-visible) .atom-dock-toggle-button-inner.bottom {
  transform: unset;
}
.atom-dock-toggle-button:not(.atom-dock-toggle-button-visible) .atom-dock-toggle-button-inner {
  transition: unset;
}

.atom-dock-toggle-button:not(.atom-dock-toggle-button-visible) {
  pointer-events: auto;
}

/////////////////////////////////
/// OR: if you do not want the toggle buttons showing up at all, use this instead:
/////////////////////////////////
.atom-dock-toggle-button .atom-dock-toggle-button-inner.left {
  transform: translateX(-50%);
}

.atom-dock-toggle-button .atom-dock-toggle-button-inner.bottom {
  transform: translateY(50%);
}