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From: BobD <daycandle@gmail.com>
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Subject: Isearch - Incremental search with predefined initial character?
Date: Sat, 4 Oct 2014 10:57:28 -0700 (PDT)
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Using  24.3.1 (i386-mingw-nt6.1.7601)

I wish to do incremental searches with the first character pre-defined, i.e. have emacs prepend a character to the characters I enter.

E.g., if I start an i-search, and then enter "abc", emacs will pretend I entered "Xabc".
If I continue the i-search, emacs will seek "Xabc".

I fiddled with isearch-mode-hook, but I couldn't see how to continue searching with the prepended character.

Do I need to fiddle with the "isearch-repeat-..." code?
Do I need to fiddle with other code?