This reverts commits
9fd6dae7939a65b67045749a0eadeb6864ded183,
4cac8025f00798938813f52dcb117be83db97f22 (minor cleanup).
Re-introducing T102346, which will be fixed in isolation.
Unfortunately even when the cursor is hidden & grabbed,
the underlying cursor coordinates are still shown in some cases.
This caused bug where dragging a button in the sculpt-context popup
would draw the brush at unexpected locations because internally
the cursor was warping in the middle of the window, reported as T102792.
Resolving this issue with the paint cursor is possible but tend towards
over-complicated solutions.
Revert this change in favor of a more localized workaround for walk-mode
(as was done prior [0] to fix T99021).
[0]: 4c4e8cc926a672ac60692b3fb8c20249f9cae679
230744d6fd