SVG export is incorrect immediately after changing canvas size

Develop Artists Feedback & Testing
1

Krita 5.2.11 on Windows 11(x64).

First, I created a 500px square document and drew a circle on a vector layer.

ss001
ss0011239×947 134 KB

The following text is the result of exporting the layer in svg format in this state.

<?xml version="1.0" standalone="no"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 20010904//EN" "http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd">
<!-- Created using Krita: https://krita.org -->
<svg xmlns="http://www.w3.org/2000/svg" 
    xmlns:xlink="http://www.w3.org/1999/xlink"
    xmlns:krita="http://krita.org/namespaces/svg/krita"
    xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
    width="120pt"
    height="120pt"
    viewBox="0 0 120 120">
<defs/>
<circle id="shape0" transform="translate(22.8000024706004, 18.9599972272398)" r="39.12" cx="39.12" cy="39.12" fill="none" stroke="#000000" stroke-width="0.47999952" stroke-linecap="square" stroke-linejoin="bevel"/>
</svg>

Next, change the canvas size to any size.

ss003
ss003387×499 15 KB

The text below was resized and exported in svg format.

<?xml version="1.0" standalone="no"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 20010904//EN" "http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd">
<!-- Created using Krita: https://krita.org -->
<svg xmlns="http://www.w3.org/2000/svg" 
    xmlns:xlink="http://www.w3.org/1999/xlink"
    xmlns:krita="http://krita.org/namespaces/svg/krita"
    xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
    width="192pt"
    height="120pt"
    viewBox="0 0 192 120">
<defs/>
<circle id="shape0" transform="translate(22.8000024706004, 18.9599972272398)" r="39.12" cx="39.12" cy="39.12" fill="none" stroke="#000000" stroke-width="0.47999952" stroke-linecap="square" stroke-linejoin="bevel"/>
</svg>

The canvas size (viewBox) has been extended, but the position of the circle has not changed. This means that although the circle is centered in Krita, it is drawn shifted to the left in the exported SVG.

If I save this document as .kri and reopen it, and export it as *.svg again, the values ​​are correct, as shown below.

<?xml version="1.0" standalone="no"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 20010904//EN" "http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd">
<!-- Created using Krita: https://krita.org -->
<svg xmlns="http://www.w3.org/2000/svg" 
    xmlns:xlink="http://www.w3.org/1999/xlink"
    xmlns:krita="http://krita.org/namespaces/svg/krita"
    xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
    width="192pt"
    height="120pt"
    viewBox="0 0 192 120">
<defs/>
<circle id="shape0" transform="translate(58.8000024706004, 18.9599972272398)" r="39.12" cx="39.12" cy="39.12" fill="none" stroke="#000000" stroke-width="0.47999952" stroke-linecap="square" stroke-linejoin="bevel"/>
</svg>

Should I consider this behavior a program bug?

2

I think so. At any moment, the export of the .svg content of a vector layer should be correct and in accordance with its canvas image.

(For a vector layer with a transform mask on it, the canvas image is the transformed raster representation of the vector layer so what you see on the canvas is not what you get in the .svg content. However, you do not have that situation.)

The Resize you performed places the circle in the centre of the canvas because, as can be seen from the small graphic diagram of the ‘old’ canvas, in red and the resized canvas, white rectangle, this is the default behaviour.
So, the .svg export should be like that.

However, the canvas correctly shows the circle in the centre of the new/wider canvas at this stage.

(I had a very quick look at this situation and used Inkscape as a convenient ‘independent witness’ to see what was inside the exported .svg file.)

When you Save, the layer .svg content (as you initially exported) would be written to the .kra file and then that .svg would be used when the .kra file was next opened, hence the shifted to the left position on the canvas when reopening it.

This needs a bit more investigation to determine exactly where errors occur, of what nature, in what order and at which stage.

@sooz , @Takiro , could you please move this topic to Artists Feedback and Testing?