Re: Freeze with Qt4.5 when acceding to Document Settings

[Abdelrazak Younes]

Vincent van Ravesteijn wrote:
Abdelrazak Younes schreef:
Vincent van Ravesteijn - TNW wrote:
Abdelrazak Younes wrote:
  
And I cannot make gdb to produce a backtrace... lyx occupying 100%
      
cpu 
and the only way to kill it is with 'kill -9'.

I tested 1.6.1 compiled against Q4.4 but running against Qt4.5 and 
1.6.2svn compiled against Qt4.5.
      
And with trunk too...

Abdel.
    

Confirmed.

1. New document,
2. Document->Settings->Preamble
3. Type "L\"
4. Any character inserted now causes LyX to freeze with 100% cpu.

Somewhere in LateXHighlighter::highlightBlock()
  

Right, this patch "solves" the problem by disabling latex 
highlighting....

Index: src/frontends/qt4/LaTeXHighlighter.cpp
===================================================================
--- src/frontends/qt4/LaTeXHighlighter.cpp      (revision 28734)
+++ src/frontends/qt4/LaTeXHighlighter.cpp      (working copy)
@@ -33,6 +33,7 @@

void LaTeXHighlighter::highlightBlock(QString const & text)
{
+       return;
       // $ $
       static const QRegExp exprMath("\\$[^\\$]*\\$");
       int index = text.indexOf(exprMath);


Abdel,

You are a true genious..

I know ;-)

Anyway, I committed a non less genius "fix". The while loop was not very 
safe in any case.

The problem lies in this block:

   // \whatever
   static const QRegExp exprKeyword("\\\\[A-Za-z]+");
   index = text.indexOf(exprKeyword);
   for (size_t i = 0; i != max_loop; ++i) {
       int length = exprKeyword.matchedLength();
       setFormat(index, length, keywordFormat);
       index = text.indexOf(exprKeyword, index + length);
       if (index == -1)
           break;
   }
   LASSERT(index >= 0, return);

Abdel.