With the SVG renderer, resizing a shape with an image fill and the mod
key showed the picture scaled during the drag, as in a normal resize.
The crop only showed after releasing the mouse.
The SVG preview applies the resize matrix to the shape node and ignores
the fill transform change carried by the modifiers. Now the pictures of
the shape fill patterns get a matrix that takes them from the old fill
transform to the new one, which undoes that resize and keeps them in
place. This works for shapes and boards.
Closes#12349
AI-assisted-by: claude-opus-5-5
With the mod key, resizing a shape with an image fill crops it: the
shape is a window over a picture that keeps its size and position.
When the dragged edge crossed the opposite one, the crop mode turned
off and a normal resize with a negative scale flipped the shape. The
image transform is relative to the shape, so the picture was mirrored
and shrank a bit more on every crossing until it disappeared.
Keep the crop mode when the edge crosses: the window moves to the
other side of the fixed edge without flipping, the part outside the
picture shows empty, and moving the window back shows the picture
again. The crop math lives in app.common.geom.image-crop and replaces
the image transform code that was duplicated for fills and fill-image.
Closes#12349
AI-assisted-by: claude-opus-5-5
