close/reload editor tab when file is (re)moved in gui terminal (bug #43922) * file-editor.cc (handle_file_remove): new code structure * main-window.cc (construct): connect new signals from octave_qt_link to the slot handle_file_renamed and the new proxy slot file_remove_proxy; (file_remove_proxy): proxy calling handle_file_remove but protected by the mutex of octave_qt_link synchronizing worker and gui thread * main-window.h: new slot file_remove_proxy * octave-qt-link.cc (do_file_remove): new method for renaming or removing files which signals the editor (gui thread) for closing the files before removing is carried out; (do_file_renamed): new method for re-loading renamed files into editor; * octave-qt-link.h: new methods do_file_remove and do_file_renamed, new signals used in the new methods for signaling the editor slots * dirfns.cc (rmdir): call the new static octave_link method for removing a file, which might be opened in the editor before removing a dir; (rename): call the new static octave_link method for renaming a file, which might be opened in the editor before renaming it and call the method for reloading the new renamed file; * octave-link.h (file_remove): new static method calling purely virtual method do_file_remove, which is implemented in octave_qt_link; (file_renamed): new static method calling purely virtual method do_file_renamed, which is implemented in octave_qt_link * syscalls.cc (unlink): call the new static octave_link method for removing a file, which might be opened in the editor before removing it

--- a/libinterp/corefcn/dirfns.cc	Sat Aug 04 13:35:29 2018 +0200
+++ b/libinterp/corefcn/dirfns.cc	Sun Sep 17 05:52:33 2017 +0200
@@ -298,10 +298,18 @@
         }
 
       if (doit)
-        status = octave::sys::recursive_rmdir (fulldir, msg);
+        {
+          octave_link::file_remove (fulldir, "");
+          status = octave::sys::recursive_rmdir (fulldir, msg);
+        }
     }
   else
-    status = octave::sys::rmdir (fulldir, msg);
+    {
+      octave_link::file_remove (fulldir, "");
+      status = octave::sys::rmdir (fulldir, msg);
+    }
+
+  octave_link::file_renamed (status >= 0);
 
   if (status < 0)
     return ovl (false, msg, "rmdir");
@@ -424,12 +432,20 @@
 
   std::string msg;
 
+  octave_link::file_remove (from, to);
+
   int status = octave::sys::rename (from, to, msg);
 
   if (status < 0)
-    return ovl (-1.0, msg);
+    {
+      octave_link::file_renamed (false);
+      return ovl (-1.0, msg);
+    }
   else
-    return ovl (status, "");
+    {
+      octave_link::file_renamed (true);
+      return ovl (status, "");
+    }
 }
 
 DEFUN (glob, args, ,