[Qgis-developer] Dropping the "render" checkbox

[Martin Dobias]

On Tue, Feb 28, 2017 at 4:22 PM, Matthias Kuhn <matthias at opengis.ch> wrote:
> 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.

Yeah that's one of the things I wanted to improve within MTR, but
didn't get to it yet - it would definitely make the render flag less
interesting. And the same thing could be done also for labeling - only
switch to the newly computed labeling when it is finished.

As Nyall said in the first mail, if you need to use the render flag,
then there is some problem with rendering - so knowing cases when
people still use it is very useful as we can make QGIS behave nicely
without the need for render checkbox! So please keep posting your use
cases :-)

Cheers
Martin