[Bug 281227] KMail2 4.7's "Find messages ..." reproducibly fails to search: "Unknown error. (Unable to create persistent search)"

[Maurice Batey]

https://bugs.kde.org/show_bug.cgi?id=281227

--- Comment #30 from Maurice Batey <maurice at bcs.org.uk> ---
Regarding Find Messages on the 'To or 'From' fields, the search appears not to
be looking for a matching string anywhere in those fields, but only for a
matching 'component' (where 'component' is either the characters to the left of
the "@", or to the right).

For example, if searching in Sent-mail for email sent to "fredsmith at gmail.com",
then a search string of "freds" would find nothing, nor would even a search
string of "gmail'!
    Only a search string of "fredsmith" would succeed at all, and even then it
might not find *all* of 'To' fields with that component.

As a test, I did a Find Messages for "gmail.com" in the 'To' fields of a
Sent-mail folder containing 4,886 emails.

KDE 4.5.2's KMail (1.13.5) found 395 emails sent to someone at gmail.com
KDE 4.8.2 on the other hand - given the same email Sent-mail folder - found
only *11* matches:

    5 'this week'
    4 in 2004
    1 in 2005
    1 last week

 - which leads me to conclude that 4.8.2's Find Messages is well and truly
broken, and so unusable, thus rendering KMail 4.8.2 itself unusable...

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