* src/output_plaintext.C
(writePlaintextParagraph): Use compare_ascii_no_case instead of
compare_no_case, since the strings to compare are pure ASCII anyway.
* src/frontends/qt4/QPrefsDialog.C
(setComboxFont): ditto
* src/MenuBackend.C
(Menu::checkShortcuts): ditto
* src/frontends/qt4/QLImage.C
(QLImage::loadableFormats): Use ascii_lowercase instead of lowercase
since the input is pure ASCII anyway.
* src/tex2lyx/text.C
(splitLatexLength): ditto
* src/support/lstrings.[Ch]
(compare_no_case): Get rid of both std::string variants
(lowercase): Get rid of std::string variant
(uppercase): Change std::string variant to docstring
* src/support/tests/regfiles/lstrings: Add new expected output
* src/support/tests/lstrings.C: Add tests for docstring functions
git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@17371 a592a061-630c-0410-9148-cb99ea01b6c8
