Unexpected behavior when repeatedly calling map.setZoom with the same zoom level

Steps to reproduce Steps to reproduce the behavior:

• go to this JS Fiddle with an example of the issue
• hit the button three times
• the first time, the map zooms to the specified zoom level
• the second time, it zooms to the feature’s bounds
• the third time, it zooms back out to the specified zoom level
• the pattern continues each time the button is pressed.

Expected behavior I expect that calling map.setZoom repeatedly with the same argument will result in no change if the zoom is already at that value

Current behavior The map is zooming back and forth between the desired zoom level and the bounds of the feature

Environment

• Leaflet version: 1.6.0
• Browser (with version): Firefox 72.0.2
• OS/Platform (with version): MacOS 10.14.6

Additional context I also noted this behavior if you replace lines 12 & 13 with this:

map.fitBounds(circle.getBounds());
map.fitBounds(circle.getBounds(), {maxZoom: 14});

[johnd0e]

Workaround: use option {animate:false}.

        map.fitBounds(circle.getBounds(), {animate:false});
        map.setZoom(14, {animate:false});

Note that you need to disable animation for both command, otherwise you will get funny effect.

[johnd0e]

I still tend to think that this is leaflet flaw