Searching for punctuation freezes the e-book viewer

[Sami Boukortt]

The search feature in the e-book reader normally ignores punctuation such as ", %, etc. However, searching for a string consisting only of such characters is not treated the same way as having entered nothing. Instead, it throws the e-book reader into an infinite loop where it returns thousands of identical results and stops responding – perhaps actually searching for an empty string and thereby never advancing?

The bug is extremely easy to reproduce, with apparently 100% reliability:

1. Open any e-book in the e-book viewer
2. Search for %

This is with Calibre 6.15.1.

[ownedbycats (ownedbycats)]

Confirmed this, though on a relatively short book it _did_ eventually finishe.

[Kovid Goyal (kovid)]

Fixed in branch master. The fix will be in the next release. calibre is usually released every alternate Friday.

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