[LyX/2.1.x] Do not allow the manual insertion of a directory (without filename) into the import dialog and thus prevent an assertion.

[Richard Heck]

commit 892da302d694ed19687776405791056372d6d13c
Author: Juergen Spitzmueller <sp...@lyx.org>
Date:   Sun Mar 23 13:31:21 2014 +0100

    Do not allow the manual insertion of a directory (without filename) into 
the import dialog and thus prevent an assertion.
    
    Fixes: #7437(cherry picked from commit 
afd897029917a083fbeb84cccd4e6cb0a21db7ed)

diff --git a/src/frontends/qt4/GuiView.cpp b/src/frontends/qt4/GuiView.cpp
index 28c6f3a..ae50045 100644
--- a/src/frontends/qt4/GuiView.cpp
+++ b/src/frontends/qt4/GuiView.cpp
@@ -2119,6 +2119,18 @@ void GuiView::importDocument(string const & argument)
        // get absolute path of file
        FileName const fullname(support::makeAbsPath(filename));
 
+       // Can happen if the user entered a path into the dialog
+       // (see bug #7437)
+       if (fullname.onlyFileName().empty()) {
+               docstring msg = bformat(_("The file name '%1$s' is invalid!\n"
+                                         "Aborting import."),
+                                       from_utf8(fullname.absFileName()));
+               frontend::Alert::error(_("File name error"), msg);
+               message(_("Canceled."));
+               return;
+       }
+
+
        FileName const lyxfile(support::changeExtension(fullname.absFileName(), 
".lyx"));
 
        // Check if the document already is open
diff --git a/status.21x b/status.21x
index cb44e13..ed6bd95 100644
--- a/status.21x
+++ b/status.21x
@@ -65,6 +65,8 @@ What's new
 
 - Fix crash when CheckTeX hits mathed (bug 8798).
 
+- Fix assertion when entering a path into the import dialog (bug 7437).
+
 - Failed instant preview compilation now returns an error. And a red box is 
   drawn around very small preview imagines, so they can be seen (bug 7522).