Zoom to layer works incorrectly while layer editing

[dr]

1. Open raster layer (​http://gis-lab.info/share/DR/modis.7z);
   
2. Add new polygonal vector layer;
   
3. Draw little polygon in right top corner of raster;
   
4. Stop editing and save changes;
   
5. Make with zoom out tool raster layer looks like small rectangle in center of View;
   
6. Toggle editing and draw new polygon in right top corner of view;
   
7. Without stopping editing try make zoom to layer on vector layer;
   
8. Looks like extent calculates incorrect.
   
9. Stop editing, don't save changes and try zoom to vector layer again. Zoom to layer work incorrectly.
   

[gislab]

5-7. I confirm, the extent looks wrong. ​http://gis-lab.info/images/screenshots/20101028-69a-65kb.jpg

9. I confirm, after rejecting saving new polygon it seems that extent is still larger than small polygon on the raster.

​http://gis-lab.info/images/screenshots/20101028-19d-62kb.jpg

[jef]

Recalculating the extent on every editing operation could be quite expensive. So it might be useful to make this optional and disable "zoom to layer" while editing. There's also the issue of undo/redo.

[sunilkcube]

Sequence Diagram to illustrate the bug situation

[borysiasty]

What about recalculating the extent when the "zoom to layer" pressed (only if the layer is dirty).

[sunilkcube]

Replying to borysiasty:

What about recalculating the extent when the "zoom to layer" pressed (only if the layer is dirty).

The comment from Jef tells that calculating extents while editing is quite expensive.

[borysiasty]

Replying to sunilkcube:

The comment from Jef tells that calculating extents while editing is quite expensive.

Not exactly, the comment from Jef is about recalculating on every operation.