Fix inventory drag drop flag (#6416)

src/guiFormSpecMenu.cpp

@@ -3449,7 +3449,7 @@ bool GUIFormSpecMenu::OnEvent(const SEvent& event)
						// no shift: select item
						m_selected_amount = count;
						m_selected_dragging = true;
						m_rmouse_auto_place = false;
						m_auto_place = false;
					} else {
						// shift pressed: move item
						if (button != 1)
@@ -3507,19 +3507,19 @@ bool GUIFormSpecMenu::OnEvent(const SEvent& event)
			}

			m_selected_dragging = false;
			// Keep count of how many times right mouse button has been
			// clicked. One click is drag without dropping. Click + release
			// + click changes to drop one item when moved mode
			if (button == 1 && m_selected_item != NULL)
				m_rmouse_auto_place = !m_rmouse_auto_place;
			// Keep track of whether the mouse button be released
			// One click is drag without dropping. Click + release
			// + click changes to drop item when moved mode
			if (m_selected_item)
				m_auto_place = true;
		} else if (updown == -1) {
			// Mouse has been moved and rmb is down and mouse pointer just
			// entered a new inventory field (checked in the entry-if, this
			// is the only action here that is generated by mouse movement)
			if (m_selected_item != NULL && s.isValid()) {
				// Move 1 item
				// TODO: middle mouse to move 10 items might be handy
				if (m_rmouse_auto_place) {
				if (m_auto_place) {
					// Only move an item if the destination slot is empty
					// or contains the same item type as what is going to be
					// moved

src/guiFormSpecMenu.h

@@ -411,7 +411,7 @@ class GUIFormSpecMenu : public GUIModalMenu
	u64 m_hovered_time = 0;
	s32 m_old_tooltip_id = -1;

	bool m_rmouse_auto_place = false;
	bool m_auto_place = false;

	bool m_allowclose = true;
	bool m_lock = false;