IIRC, the issue is mainly that labels come last but are removed directly.

Le mar. 28 févr. 2017 à 09:22, Matthias Kuhn <[email protected]> a écrit :

> On 02/28/2017 08:47 AM, Denis Rouzaud wrote:
> > Hi,
> >
> > I'm a big -1 on this.
> >
> > We often use this for digitizing operations such as manual label
> placement.
> >
> > If you have a projects which takes quite some time to render, it is very
> > powerful to
> > 1. place the canvas at the proper extent
> > 2. disable rendering
> > 3. move all the labels needed
> > 4. re-enable rendering for controlling
>
> Isn't this an issue triggered by clearing the canvas before the next
> rendering process has been finished?
>
> If the content (per layer) would only be replaced on the screen, once
> the subsequent rendering process has finished, such tasks would also be
> possible without using this checkbox.
>
> Matthias
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