23853 Add support for IME-based text input on Windows (affects: desktop, affects: text input, cla: yes, platform-windows)

platform-windows - 14 pull request(s)

21523 Add missing returns in system channels handlers (affects: desktop, cla: yes, needs tests, platform-windows)

21612 Separate mutators for text and selection (affects: desktop, affects: text input, cla: yes, platform-linux, platform-windows, waiting for tree to go green)

21663 Store selection base/extent as size_t (affects: text input, cla: yes, platform-linux, platform-windows)

21682 Add multi-step IME support to TextInputModel (affects: text input, cla: yes, platform-linux, platform-windows)