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USJonathan Thomas
 

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    1. POQWidget deletion problem
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    1. COThis turned out to be a rather mundane issue. I had moved this class to a second directory, but for some reason qmake didn't mark the MainWindow class that was using the QWidget-derived class as being needed to rebuilt. Adding the pointer as a member variable changed the class's size, which caused memory corruption issues upon deletion. The application target still linked since I hadn't changed the ABI of the class's constructor, but the change of size of the QWidget-derived class is what caused all my issues.
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    2. COYeah, but that wouldn't explain the _double_ free. The non-member variable version also parented "this", so one would have expected the same behavior. It wound up being a corruption, not a double free, though. It turned out to be a memory corruption due to a file move and qmake not detecting it. I posted more details as a comment to my original question.
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    3. COI suppose that the documentation is inaccurate in that regard. (About the impossibility of using a custom delegate with an item-based view.) QTreeWidget and freinds are based off of the QTreeView classes (only offering a simplified interface for using QTreeItems), so it does appear that you can set custom delegates and such. At any rate you'll still probably need to take a look at the paint() function of the delegate. If you did a setFlags(flags() |= Qt::ItemIsEditable) on each of the items in the second column, your existing code would probably display the toolbutton on a double click.
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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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