67203c0ec8
No functional changes. Merge the modal callbacks of the `VIEW3D_OT_move`, `VIEW3D_OT_rotate` and `VIEW3D_OT_zoom` operators into a single simplified `view3d_navigate_modal_fn` callback. Deduplicate code for initialization, also the code for finalization and the code to get the `event_code`. Improve support for operation switching by the existing (but unused) modal keymap items `VIEWROT_MODAL_SWITCH_ZOOM`, `VIEWROT_MODAL_SWITCH_MOVE` and `VIEWROT_MODAL_SWITCH_ROTATE`. Pull Request: https://projects.blender.org/blender/blender/pulls/106279
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