https://bugs.documentfoundation.org/show_bug.cgi?id=166835

            Bug ID: 166835
           Summary: Warn when first introducing an
                    opened-file-format-incompatible aspect into a document
           Product: LibreOffice
           Version: unspecified
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: medium
         Component: LibreOffice
          Assignee: [email protected]
          Reporter: [email protected]

Scenario: User opens a non-ODT document for editing, starts making edits, and
at some point introduces something into the document which would be lost when
saving the file in its original format. 

Examples: 

* An XLSX is edited, and a function is used which MS Excel does not support, or
a chart type it's missing.
* A DOCX is edited, tracked changes are made, and a comment is made on a
tracked change (i.e. not Insert > Comment).

At the moment - the user is none the wiser, until they try to save the
document, and will then be warned that the save will be destructive because of
format limitations.

But by then, it is very late to do something about - some time may have passed,
many such items or aspects may have been introduced, and further editing done
which relies on them. Also, IIANM, the user does not get an exhaustive list of
unsupported aspects/pieces of the document to review.

For that reason I suggest that, when editing a file in a given format, and when
we first introduce something into the document unsupported by the format, we
could alert the user to this through:

* An info-bar
* A pop-up dialog
* Some kind of visual indication in the status bar

this alert could ask the user "do you really want to do XYZ?" Or it could just
tell them that the last change breaks the file format.

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