The creator (2026-10-30): the brand-logo field in App Settings showed only a file NAME, so a
myopic user could not confirm which picture was set. Now a 28x28 thumbnail sits left of the
field showing the actual image, and hovering it opens an enlarged copy (up to 420x320) beside
the panel with the file name underneath. A click collapses it; moving the pointer away closes
it, unless the pointer walked onto the popup itself, where it stays so the creator can look
closely.
Mechanics:
- `MainViewModel.BrandLogoPreviewImage` decodes the stored asset ONCE and freezes it, so the
thumbnail and the enlargement share one bitmap and no dispatcher hop is needed. A corrupt
image returns null instead of taking the dialog down.
- The thumbnail is hidden when no image is set (NotNullToVis), so there is nothing to hover and
no empty frame can appear.
- The popup is a separate window: WPF refuses to open one until its placement target is in a
live visual tree, which is why the test hosts the control in a real window rather than
asserting on a detached control.
Guard: BrandLogoPreviewTests — the wiring (image binding, the no-image gate, the four gesture
handlers, the readable enlargement size) and the control's open/close behaviour.
gramps
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