[REG 6.7.3] Wayland text input v3: input method window no longer updates its positions

Since 6.7.3 (0205ef5917bc529b0625a724e0f9b59626c774f9), the input method window won't move along the cursor; it stays where it initially is. E.g. run the command

QT_WAYLAND_TEXT_INPUT_PROTOCOL=zwp_text_input_v3 WAYLAND_DEBUG=1 dolphin &> /tmp/w.log

and find a place to type something with an input method (e.g. fcitx5). In the log we can see that there are multiple set_cursor_rectangle calls, but no commit calls. So the position won't update.

This is regressed by QTBUG-126275 and it only affects text input v3 so normal KDE users are not affected.