…on pyramids. Use Stacked as internal name for stacked diagrams and StackedBar for stacked bar diagrams. Add subDiagram parameter to QgsDiagramRenderer::diagramSize() and QgsDiagramRenderer::diagramSettings() (single and interpolated) to get subdiagrams info.

…iceversa

… subdiagrams backwards)

…vector properties page. For the moment, it works with single diagrams, hiding controls for stacked diagrams

…roperties; remove subdiagram button disabled when subdiagram count is 2 (minimum value to have a stacked diagram); when switching from stacked to single diagram, extra tabs are hidden

…arts to QgsDiagramProperties for subdiagrams

…ubdiagrams order

…gis#58501)

…dDiagramProperties

…DiagramProperties to the side of the main diagram type combobox

…ng to subdiagrams' syncToLayer when needed

…rams. This allows subdiagrams to define their own sizes and legends; add tests for a stacked diagram composed of mixed renderers (single category and linearly interpolated categories), as well as nested stacked diagrams.

…d of a list when docked; harmonize stacked diagram configuration with rule-based labeling; allow QgsDiagramProperties to sync to renderers and diagram layer settings, in addition to syncing to layers; when editing a subdiagram of a stacked diagram, only show widgets for diagram layer settings if the subdiagram is the first one, for the rest, hide those widgets and show a note informing users; make sure stacked diagrams handle enabled and disabled subdiagrams (i.e., don't take into account disabled subdiagrams) and add a test for it; switching from single to stacked diagram: take the single diagram definition as the first stacked diagram; fix qgis#58782 (calling twice the apply method for label rendering)

…n subdiagrams; test included

…box to remove horizontal scroll bar in panel; bring back default values that had been lost in recent changes

…subpanel

…erse)

…; switch from string-based connections to functor-based ones

…ng with scale dependent visibility