[libcalamares] Explain updating-status-text mechanism
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@ -188,6 +188,13 @@ private:
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// starts the job, or if the job itself reports 0.0) be more
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// accepting in what gets reported: jobs with no status fall
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// back to description and name, whichever is non-empty.
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//
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// Later calls (e.g. when percentage > 0) use the status unchanged.
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// It may be empty, but the ExecutionViewStep knows about empty
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// status messages and does not update the text in that case.
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//
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// This means that a Job can implement just prettyName() and get
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// a reasonable "status" message which will update only once.
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if ( percentage == 0.0 && message.isEmpty() )
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{
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message = jobitem.job->prettyDescription();
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