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7b6e636c13
IDEA didn't use to report pointless String.substring invocations for
cases when only one character in the string is extracted. In such cases
it makes more sense to use the String#charAt method because it is
allocation free.
IDEA didn't use to suggest to refactor for the code when String.substring
selects a single character and is followed by the equals method(e.g.
args[0].substring(0, 1).equals("_")) to more readable version e.g.
args[0].charAt(0) == '_'.
This patch adds such refactorings to both of the cases. It also adds
the possiblity to handle expressions like "i+1" and "i+2" to
com.siyeh.ig.psiutils.ExpressionUtils#isDifference.
Signed-off-by: Nikita Eshkeev <nikita.eshkeev@jetbrains.com>
GitOrigin-RevId: 6d179c7c9c605f08b4d4468712f8468fd68045a1