Mat4f::mul(a, b) was computing b*a due to transposed summation
indices in the multiplication loop. All call sites (glTF TRS
composition, view-projection, MVP chains, scene hierarchy) are
written expecting standard a*b order, and transform_vec4 uses
standard column-major M*v convention.
Fix: swap the operand bindings so the existing index pattern
produces the correct a*b result.
Add regression test mat4_mul_order that verifies:
- Scale(2)*Translate(5,7) yields tx=10 (scaled translation)
- transform_vec4 on result*(1,1,0,1) yields (12,16)
Co-authored-by: ant <ant@offline.click>
* Fix modal event handling behavior
Everything now works as expected, *except* for Scroll events that seem to
still be received by views beneath the modal, e.g., an underlying PortalList.
* Enable widgets to block scrolling, except within a certain area
* This is important for Modals to prevent scrolling of background widgets
whilst still allowing the inner `content` view to be scrolled.
* Modals are now forcibly full-screen (or rather, full-window)
in order to properly ensure that scrolling-allowed areas
always stay relevant, as the Modal can no longer be contained
within a non-full-window parent widget/view.
* remove errant log statement
