Wrong image preview and image preview size in form

[hkautz]

I have problems with the integrated document viewer when an attribute form is created with the drag and drop designer.

I am working with a gpkg layer (polygon) where some attributes are paths to images/photos.
For fill in data, I use the Attributes Form -> for better structure I use the form Layout drag and drop designer. (Layout see attachment as sshot_1.png)
and for images/photos the Widget Type „Attachment“.

I have defined the image width/height in the Integrated Document Viewer to 150X150px.
When visualizing the table in the form view, some strange things in displaying the former inserted pictures appear: The images start as a 1x1px image and grows automatically to the full size as wide as the attribute form. Completely ignoring the defined 150x150px. Until every single image reaches the full size, the system is blocked so I can only watch the images growing.

The second issue when working with this layer is following:
(This issue could not be reproduced in the attached sample– it only appeared in the original project but I suggest it could have the same origin)

When switching between different features, I would expect that:

• If an image was selected and saved before, it should be displayed.
• If no image has been selected before, the image path and the preview should be empty

What on my system appears is following:

• If an image was selected and saved before, the image grows as described in the first part.
• If no image has been selected before, the image path is empty but the image from the feature I selected before is displayed by growing.

How to Reproduce

1. create a layer (.shp or .gpkg layer) with attribute fields for the photo path. Type Text, Length: 250 (Or use the sample data attached)
2. in the layer properties choose Attribute form
3. Use the Drag and Drop Designer and structure the form as in the sshot_1.png
   Tab1 (create Category Tab1 as a Tab, foto1 as a group in a container and so on)
   Define the widget type "Attachment" for each of these fields
   In the Integrated Document Viewer set the Type to Image and try to set a preview size of 150x150px
4. Change to edit mode and digitize some objects and add on some features fotos per path.
5. Save and stop editing
6. in the attribute table switch to Form View and select different features.
7. Voila - !
   QGIS and OS versions

QGIS version	3.4.13-Madeira	QGIS code revision	QGIS code revision
Compiled against Qt	5.11.2	Running against Qt	5.11.2
Compiled against GDAL/OGR	2.4.1	Running against GDAL/OGR	2.4.1
Compiled against GEOS	3.8.0-CAPI-1.13.1	Running against GEOS	3.8.0-CAPI-1.13.1
PostgreSQL Client Version	11.5	SpatiaLite Version	4.3.0
QWT Version	6.1.3	QScintilla2 Version	2.10.8
Compiled against PROJ	5.2.0	Running against PROJ	Rel. 5.2.0, September 15th, 2018
Active python plugins	attributePainter; latlontools; mapswipetool_plugin; openlayers_plugin; Qgis2threejs; qgis2web; quick_map_services; SelectWithin; shapetools; db_manager; MetaSearch; processing
problem.zip

[gioman]

How to Reproduce

1. create a layer (.shp or .gpkg layer) with attribute fields for the photo path. Type Text, Length: 250 (Or use the sample data attached)

2. in the layer properties choose Attribute form

3. Use the Drag and Drop Designer and structure the form as in the sshot_1.png
   Tab1 (create Category Tab1 as a Tab, foto1 as a group in a container and so on)
   Define the widget type "Attachment" for each of these fields
   In the Integrated Document Viewer set the Type to Image and try to set a preview size of 150x150px

4. Change to edit mode and digitize some objects and add on some features fotos per path.

5. Save and stop editing

6. in the attribute table switch to Form View and select different features.

7. Voila - !

@hkautz could you attach an already prepared project? thanks!

[hkautz]

@gioman THX for replying - in the attached problem.zip is the gpkg included which you can open and see the issue.

[gioman]

@hkautz

There are actually two (or more?) issues. The one about the wrong preview size and the "growing" effect:

and the fact that if the if the form points to a picture with a path that is wrong/not available then QGIS shows the WRONG picture. In the image below the path

d:\problem\pictures\b.jpg

does not exist, but in form view QGIS shows the image of the previous record/feature. I'll tag this as HIGH PRIORITY as showing the wrong picture can leas to very bad results/decisions...

By the way I tested on QGIS master on Windows.

[alexbruy]

Probably related to #23223

[elpaso]

@alexbruy do you want to take this?
If not, I can have a look, doesn't sound trivial though.

[alexbruy]

@elpaso unfortunately I don't have much time — need to do other work and also preparing to 5 day workshop.

[qnmai]

@elpaso Which version of QGIS takes this change into consideration? Cheers