Write a condition:

if (something) {

And QtCreator automatically adds the closing bracket:

if (something) {}

which is sometimes inconvenient, e.g. when you want to add a condition for existing block of code.

You have a code:

firstFunction();
secondFunction();

And then after adding a new condition:

if (something) {}
firstFunction();
secondFunction();

you must remove the closing bracket manually every time before adding an indentation and closing bracket to the end of code block.

This won't happen in QtCreator older than 4.4. This issue also doesn't happen when opening bracket is added without a condition or loop keyword.