Currently, it's unclear which zoom variant is currently active. The idea actually was that the zoom actions would remain selected (or: "enabled, see below) if clicked, so that this would be clear (see screen shots).

This change request requires to:

• change actions to be able to optionally have a state (enabled/not enabled)
  • if an action's state is "enabled", the action's text color becomes green (same as green shown on hover, currently), else it's white
  • on hover, an "enabled" action remains green (don't show white on hover)
  • on click, an "enabled" action shows its text in white. You can click on an "enabled" action again, to re-enable and reset it-
• ensure that the current zoom variant is indicated by the corresponding action being "enabled"