Calixte Denizet c677b167b6 Set a z-index for the different layers within a page (fixes #15861)
Each layer has an absolute position, hence it induces the creation of
some stacking contexts (see https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Positioning/Understanding_z_index/The_stacking_context).
Thanks to this feature, we don't have to worry about the z-index used in
the annotation layer and how form elements interact with the other layers.
2022-12-26 22:55:08 +01:00
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