[Octave-bug-tracker] [bug #53176] Variable Editor shows placeholder instead of the variable after executing 'clear all'

[Dan Sebald]

Follow-up Comment #1, bug #53176 (project octave):

"As a side note, if someone can explain me when the following line will be
used in the patch ?
I don't think we will want to print the statement other than a string. (for
which role== Qt::DisplayRole)"

The "subclassing" is described here:

http://doc.qt.io/qt-5/qabstractitemmodel.html#subclassing

of which the following seems most pertinent:

"Most models provide at least a textual representation of item data for the
Qt::DisplayRole, and well-behaved models should also provide valid information
for the Qt::ToolTipRole and Qt::WhatsThisRole. Supporting these roles enables
models to be used with standard Qt views. However, for some models that handle
highly-specialized data, it may be appropriate to provide data only for
user-defined roles."

I think what this means is that Qt entities like QTextEdit handle data in a
general way where some of its features may want a tooltip representation of
the data, or an icon representation of the data, etc.  In this case Octave is
being a bit incomplete in just putting and X for any other role other than
displaying it, say, in a QTextEdit window.

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