* Test(MapDragSpec): add mouse drag with CSS scaled container
This test is failing as of this commit.
* Fix(Draggable): measure drag compensating for CSS scale
so that the computed offset (i.e. user drag length) is divided by the CSS scale applied on the `_element`'s container. Later on when `Draggable` updates the `_element`'s position, the latter is affected by the CSS scale by the browser.
Added a `getSizedParentNode` function in `DomUtil` in order to automatically retrieve the closest parent node in the DOM hierarchy tree that has a non null size (so that we can compute the scale in `DomEvent.getMousePosition`), without having to specify the parent node explicitly (which is ugly).
* Fix(getMousePosition): getBoundingClientRect is in page scale
therefore it must also be divided by the container scale in order to compute the relative position of the event in the scaled container.
* Test(MarkerDragSpec): add drag with CSS scaled container
this should pass automatically at this commit, thanks to the previous modification of Draggable.
* Debug(map-scaled): add draggable marker
as well as another CSS scaled wrapper, plus some border and padding, and debugging console logs, to make sure the computations of `getMousePosition` are correct (correctly removing the border width, and compensating for CSS scale).
* Docs(getMousePosition): explicitly exclude border
* Docs(DomUtil): add return value of getSizedParentNode
was missing in docstring.
* Feat(DomUtil): add getScale function
so that it can be used by DomEvent.getMousePosition and Draggable.
* Refactor(Draggable): cache container scale
to avoid triggering browser reflow continuously during _onMove, but only on drag start (_onDown).
By compensating for the scale within Draggable instead of delegating to DomEvent.getMousePosition, it also becomes possible to check first for the clickTolerance, so that we prevents user's small movement based on screen, irrespective of rendered scale.
* Test(Map+MarkerDrag): remove scale on initial movement
that is intended to overcome Draggable clickTolerance, since now it is based on screen pixels, irrespective of applied CSS scale on the map.
Thanks to the tolerance in the expected final position, this has no effect on the result of the test, even though the overall drag is now slightly shorter.
* Refactor(DomEvent): use DomUtil.getScale in getMousePosition
to factorize scale computation (also used within Draggable).
* Docs(Marker): explain checks for re-using icon element
when the marker is modified with an icon of the same type (i.e. an image icon with an image icon, or a DivIcon with a DivIcon), or checks for NOT re-using the icon element when modifying with an icon of a different type (i.e. an image icon with a DivIcon, or the reverse).
* Revert "Div icon accept node element as option (#5517)"
This reverts commit ba7bfb5011.
Conflicts:
spec/suites/layer/marker/MarkerSpec.js
* Added option to allow DOM elements inside a DIV icon
* Removed white line
* Adapted so that the dom element can be passed with the html option
* Update DivIcon.js
Changed documentation to state HTMLElement
* Add some tests for #5293
* Fix enabling marker dragging while markers aren't on the map by removing the dragging object when not on the map.
This is a change of behavior (.dragging is only defined when a marker is on the map).
* Docs for dragging change
* Fix L.Evented.listens() on removed event handlers, #4474
* Fix bad unit tests for marker events
* Only check for listerners.length if listerners is actually defined
