Grouping user edits in QPlainTextEdit widget

[john at sturtz.org]

Hi again all.

I have a QPlainTextEdit widget.  I place the cursor in the middle of a line, type a few characters and then hit [Enter].  Now if I want to undo that edit, it takes two .undo() calls -- the first removes the newline, the second the typed text.

I'd like to consider the entire edit one group, which a single .undo() undoes.

My ostensible solution was to call .beginEditBlock() prior to the edit, then .endEditBlock() after the edit.  And that does in fact work -- a single .undo() call then undoes the entire edit.  Unfortunately, after the .beginEditBlock() call, while the edit is occurring, the widget doesn't update.

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Sample code attached.  To demonstrate:


1. Place cursor somewhere in the middle of the line.  Type a few characters and hit [Enter].
Type [ctrl+U] to manually call .undo().  First time removes the newline, second time removes the typed characters.

2. Place cursor somewhere (else) on the line.
Type [alt+B] to call .beginEditBlock().
Type a few characters and hit [Enter].  The characters overtype, and the widget doesn't update.
Type [alt+E] to call .endEditBlock().  Now the widget updates.
A single [ctrl+U] undoes the entire edit.


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Are .beginEditBlock()/.endEditBlock() only really intended to be used for programmatic editing of the text and not user interaction?

Thanks!

/John
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