Fix bug #5540: Crash in MathAtom on Undo.

[lyx.git] / src / paragraph_funcs.cpp

diff --git a/src/paragraph_funcs.cpp b/src/paragraph_funcs.cpp
index 2881c49325adfc0dde489fdd4a0dcba16068ea0c..0459ed79117dcef4dbdddd46935e9b637735bd2e 100644 (file)
--- a/src/paragraph_funcs.cpp
+++ b/src/paragraph_funcs.cpp
@@ -305,6 +305,20 @@ Font const outerFont(pit_type par_offset, ParagraphList const & pars)
 }
 
 
+bool isFullyDeleted(ParagraphList const & pars)
+{
+       pit_type const pars_size = static_cast<pit_type>(pars.size());
+
+       // check all paragraphs
+       for (pit_type pit = 0; pit < pars_size; ++pit) {
+               if (!pars[pit].empty())   // prevent assertion failure
+                       if (!pars[pit].isFullyDeleted(0, pars[pit].size()))
+                               return false;
+       }
+       return true;
+}
+
+
 void acceptChanges(ParagraphList & pars, BufferParams const & bparams)
 {
        pit_type pars_size = static_cast<pit_type>(pars.size());