[poppler] RFC: Expose whole-words search option in Qt frontends

[Adam Reichold]

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Hello,

Attach is a patch that would expose Poppler's whole-words search
option within the Qt frontends.

While the implementation seems straight forward so far, I would like
to request comments whether extending the "SearchMode" enumeration to
flag definition is considered harmless. The proper way to do it seems
to be the introduction of "QFlags<SearchMode>" which would however
break compatibility and hence imply the need to have an additional
overloads using a separate flag (and enumeration?) definition.

Best regards, Adam.
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