-void switchBetweenClasses(TextClassPtr const & c1,
- TextClassPtr const & c2, InsetText & in, ErrorList & errorlist)
+bool reduceSelectionToOneCell(Cursor & cur)
+{
+ if (!cur.selection() || !cur.inMathed())
+ return false;
+
+ CursorSlice i1 = cur.selBegin();
+ CursorSlice i2 = cur.selEnd();
+ if (!i1.inset().asInsetMath())
+ return false;
+
+ // the easy case: do nothing if only one cell is selected
+ if (i1.idx() == i2.idx())
+ return true;
+
+ cur.top().pos() = 0;
+ cur.resetAnchor();
+ cur.top().pos() = cur.top().lastpos();
+
+ return true;
+}
+
+
+bool multipleCellsSelected(Cursor const & cur)
+{
+ if (!cur.selection() || !cur.inMathed())
+ return false;
+
+ CursorSlice i1 = cur.selBegin();
+ CursorSlice i2 = cur.selEnd();
+ if (!i1.inset().asInsetMath())
+ return false;
+
+ if (i1.idx() == i2.idx())
+ return false;
+
+ return true;
+}
+
+
+void switchBetweenClasses(DocumentClass const * const oldone,
+ DocumentClass const * const newone, InsetText & in, ErrorList & errorlist)