templateview.h only included <QGraphicsView> but uses
QGraphicsGridLayout (tbgrid_ member) and QGraphicsLayoutItem
(indexOf/removeItem signatures) directly. Some Qt5 header
apparently pulled these in transitively; Qt6's leaner headers
don't, so the class fields/methods silently failed to resolve
and the compiler picked bogus 'int*' overloads instead.
Other files in the same directory already get these symbols
either via the <QtWidgets> umbrella header or a direct include,
so this was an isolated gap.
scorpio810
6716c267b8