* GuiView.cpp: disable symbols dialog in read-only mode.

git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/branches/BRANCH_1_6_X@30987 a592a061-630c-0410-9148-cb99ea01b6c8

src/frontends/qt4/GuiView.cpp

@@ -1210,7 +1210,7 @@ bool GuiView::getStatus(FuncRequest const & cmd, FuncStatus & flag)
 			}
 		}
 		else if (name == "symbols") {
-			if (!view() || view()->cursor().inMathed())
+			if (buf->isReadonly() || !view() || view()->cursor().inMathed())
 				enable = false;
 			else {
 				InsetCode ic = view()->cursor().inset().lyxCode();

status.16x

@@ -202,6 +202,9 @@ What's new
   (e.g. ".lyx15"). This avoids a crash when loading two files with
   identical names but different extensions (bug 5646), and disambiguates
   such files in the user interface.
+
+- Disable Symbols dialog for read-only dialog. This prevents a potential
+  crash.
   
 - Fall back to default UI file if the specified one cannot be found
   (bug 6076).