[Qgis-developer] [WIP] slider to zoom canvas like a magnifier

[Paul Blottiere]

Announcing WIP for a slider providing a way to zoom the canvas, like a
magnifier does.

A use case is for example to facilitate the manual placement of small
labels.

A way to set up this tool is planned too (minimum, maximum and step).

Let me know if you have any comments.

Regards,
Paul Blottiere
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