[ClangFormat] Incorrect indentation on pasting code

When ClangFormat is enabled, pasted code is incorrectly indented in some instances.

Steps to reproduce:

1. Unpack the attached project.
2. In the unpacked project directory, backup main.cpp by copying it to e.g. main.cpp-orig.
3. Open and configure the project in QtCreator (Boost needs to be installed on the system).
4. Open main.cpp in the editor.
5. Select all (Ctrl+A), cut (Shift+Del) and paste (Shift+Ins).
6. Save the modified main.cpp and compare it with the original main.cpp-orig.

You will notice that the resulting formatting is broken in some instances:

• The list of base classes for my_object and group_iterator are indented to the right, past the colon on the previous line.
• Some comments are indented deeper than before.
• Closing angle brackets in multi-line typedefs and base classes are indented deeper than before.
• Where indentation is modified, it sometimes contain spaces rather than tabs (i.e. the editor attempts to emulate "half-tabs").

Expected behavior:

The pasted code should look exactly like in the original.