Fix bug #7345: Crash when right clicking on displayed math with selection
Two things have been fixed here:
1) the selection should not be cleared when the user right clicks a math inset that is part of the selection,
2) the type of context menu should be determined at mouse-press, because that is the moment when the cursor is set. However, we should do it after setting the cursor, because setting the cursor might change the selection status and this influences the choice for the type of context menu.
git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@37961
a592a061-630c-0410-9148-
cb99ea01b6c8