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Optimize mime type matching

David Faure requested to merge dfaure/qtbase:work/dfaure/3c747aafa44ac2d0b314a002d2672227bf6513e5 into kde/5.15

Don't count "*", don't search for "[" and for "?" inside m_pattern on every call to matchFileName(). Do it once, when constructing the MimeGlobPattern.

Fix matching the pattern for names without any wildcard: index of question mark should be -1, not just different from 0.

This shortens loading a Qt6 project in Creator by about 500 ms.

Change-Id: Ifa40c2cec4aba07a0312ef36877e571a8c8fb151 Reviewed-by: Qt CI Bot qt_ci_bot@qt-project.org Reviewed-by: David Faure david.faure@kdab.com Reviewed-by: Jarek Kobus jaroslaw.kobus@qt.io (cherry picked from commit 3c747aaf)

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