Description of Problem:

At least some Qt apps (specifically, Opera) cannot print if dynamically
linked against Qt under Red Hat 7.2.  The print dialogs show erroneous
printer names, and print attempts silently fail.  Here's a description from
a user running into this problem:  
  
http://groups.google.com/groups?hl=en&selm=slrna49tr6.lld.cwong%40h00a0cc5b24bc.ne.mediaone.net  
Version-Release number of selected component (if applicable):

qt-2.3.1-5

How Reproducible:

Every time.

Steps to Reproduce:
1. Install Opera 5.05 dynamic (opera-5.05_tp1-6-shared_qt-libnpp-0.1.1-rh71.x86.rpm)


2. Go to a web page, then print using File->Print...



Actual Results:

The print dialog box shows strangely named printers (e.g., "lp:ml").
Print attempts fail silently, without queuing the print jobs.

Expected Results:

The print dialog box should show correctly named printers (e.g., "lp").
The print attempts should succeed in queuing the print jobs.

Additional Information:

I strace'd opera and found that /usr/bin/lp was being invoked with a bad
printer destination (eg., '-dlp::ml' instead of '-dlp').  
  
I installed qt-2.3.1-5.src.rpm and looked through the code.  It appears to
me that the qt-2.3.1-LPRng.patch is incorrect:  
  
--- qt-2.3.1/src/dialogs/qprintdialog.cpp.lprng Wed Jun 13 10:53:46 2001  
+++ qt-2.3.1/src/dialogs/qprintdialog.cpp       Sat Jun 16 09:50:58 2001  
@@ -158,7 +158,11 @@  
             QString printerName, printerComment, printerHost;  
             if ( i >= 0 ) {  
                 // have : want |  
-                int j = printerDesc.find( '|' );  
+                               // LPRng allows additional stuff like "lp=|/usr/share/printconf/something  
+                               // --> handle "=" like "|"  
+                               int j = printerDesc.find( '=' );  
+                               if( j == -1 )  
+                                   j = printerDesc.find( '|' );  
                 printerName = printerDesc.left( j > 0 ? j : i );  
                 if ( j > 0 ) {  
                     // try extracting a comment from the aliases...  
  
---------------------  
  
The printerDesc.find( '=' ) call is finding the '=' from the following capability assignment.  The code then incorrectly decides that everything before the '=' is the printer name.  
  
So a printcap entry like:  
  
lp\  
        :ml=0:\  
        :mx=0:\  
        :sd=/var/spool/lpd/lp:\  
        :af=/var/spool/lpd/lp/lp.acct:\  
        :sh:\  
        :rm=remote:\  
        :rp=lp:  
  
would be interpreted as having the printer name 'lp:ml'.  
  
I commented out the qt-2.3.1-LPRng.patch patch in the qt.spec file and built a new qt rpm.  After installing that new qt package, Opera printed as expected: the printer names are correct, and print jobs successfully queue.