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For Ctrl+Left/Right (Previous/Next Word) and related shorcuts, a "word" apparently isn't a complete identifier anymore, but a camelcase "part" of an identifier. For example, on an identifier "FooBarBaz", Ctrl+Left/Right successively moves over "Foo", "Bar" and "Baz", not over "FooBarBaz" as a whole. (Within comments and string literals, on the other hand, it behaves as expected.) I very commonly use Ctrl+Shift+Left/Right/Backspace/Del to select/delete an identifier, for example to replace it after copy&pasting some code block. It is quite annoying and not ergonomic to have to repeat it multiple times. It's also non- standard behavior for code editors for "word" to not mean "identifier", I believe. At least it should be configurable.
See the issue 101172, there is written how to switch off camel case word navigation *** This issue has been marked as a duplicate of 101172 ***