Organizer: Ctrl+click does not add to the selection (only Shift selects several) #290

9.0.0-beta.2, Linux (Debian 13, GNOME on X11). In the Organizer's tree view of calculations, Ctrl+click does not add a calculation to the selection; only Shift+click (a range) selects several.

Expected: Ctrl+click toggles one item in or out of the selection, keeping the rest; Shift+click selects a range. On macOS the same with Cmd.

Notes for whoever fixes it: the view uses the vendored wxTreeListCtrl (src/wxgui/ewxClasses/TreeListCtrl.C) with wxTR_MULTIPLE. Its mouse handler passes unselect_others = false for Ctrl, and the Shift anchor (m_shiftItem) is cleared when Shift is not held, so the control itself looks right. Check what the Organizer does on wxEVT_COMMAND_TREE_SEL_CHANGING/SEL_CHANGED (CalcMgr.C, the selection is rebuilt from p_currentSelection), whether the left tree (a separate control) is meant here, and whether GTK delivers the click with ControlDown() set. Check the right-click menu's multi-selection actions (Delete, Cut, Duplicate) once Ctrl works.