[kst] [Bug 394448] New: Not able to change data file (ASCII), message: "The file could not be loaded or contains no data."

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https://bugs.kde.org/show_bug.cgi?id=394448

            Bug ID: 394448
           Summary: Not able to change data file (ASCII), message: "The
                    file could not be loaded or contains no data."
           Product: kst
           Version: 2.0.8
          Platform: Compiled Sources
                OS: MS Windows
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: datasources
          Assignee: kst at kde.org
          Reporter: manumail at hotmail.de
  Target Milestone: ---

What I did:
1. Load a small ASCII data file with the data wizard, and create a plot
2. Save to new .kst file and close kst
3. Start kst and open this .kst file again
4. Go to change data file dialog and select a different ASCII file, click ok
5. Go to change data file dialog again, select the ASCII file from step 1.

What I expected: The data file from step 1 should be accepted and plotted,
because the file is ok and still in its location.

What happened: The file is not accepted, the program returns: "The file could
not be loaded or contains no data."

I downloaded the latest source code and traced the message back to method
ChangeFileDialog::apply(), where the message box is created upon
!_dataSource->isValid().

The _isValid attribute is false, because it is set to false by call to method
reset() in AsciiSource::parseProperties. This method is called when the .kst
file is loaded, after creation of the AsciiSource.

I removed the call to reset() and the problem dissapeared. I did not create a
patch because I'm not sure about side effects.

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