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REVISION SUMMARY
  https://bugs.kde.org/show_bug.cgi?id=421374 describes how a service file 
specified to run in a terminal gives an error saying that it cannot find 
'konsole' or the user's configured terminal program.
  
  The problem is that KIO::DesktopExecParser::resultingArguments(), if 
service.terminal() is true, prepends the terminal application to the command 
line.  If this is a relative path, as it is most likely to be (and will be in 
the default 'konsole' case), the "realExecutable" check in 
KProcessRunner::KProcessRunner() is triggered and the job aborts with an error 
message.
  
  This change expands the specified terminal executable into a full path in 
KIO::DesktopExecParser::resultingArguments(), and returns an error immediately 
if it cannot be found.  This is then prepended to the command line.  When 
KProcessRunner::KProcessRunner() checks the realExecutable (the first word of 
the command line) it will be an absolute path and the check will not fail.
  
  The order of the code blocks in KProcessRunner::KProcessRunner() is adjusted 
so that execParser.resultingArguments() is checked for being empty (an error 
return) before the first word of the command is accessed.  This means that the 
"realExecutable = execParser.resultingArguments().at(0)" test will not assert 
if resultingArguments() is an empty list.

TEST PLAN
  Built kio with this change, tested with the sample desktop file at 
https://bugs.kde.org/show_bug.cgi?id=421374#c8.  The command correctly runs in 
a terminal.

REPOSITORY
  R241 KIO

REVISION DETAIL
  https://phabricator.kde.org/D29738

AFFECTED FILES
  src/core/desktopexecparser.cpp
  src/gui/kprocessrunner.cpp

To: marten, #frameworks, dfaure
Cc: kde-frameworks-devel, LeGast00n, cblack, michaelh, ngraham, bruns

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