Blender Git Loki

Allow navigating while transforming

Navigating while transforming is not a new idea:
- https://rightclickselect.com/p/ui/Tqbbbc/allow-navigating-while-transforming (See comments);
- {D1583}
- {T37427}

This feature allows us to be more precise where the transformed element will be placed.

This would avoid, for example, the need for the node editor to automatically update the viewport when a node is transformed.

And with {D9415} navigating while transform becomes a necessity because: how could we move from a point at the bottom of one object to the top of another without being able to rotate the view?

The patch implements this feature as being experimental (See image):
{F11826349, layout=left, width=600}
Because transform's modal keymaps conflict, two (temporary) operators were created to update the keymap and avoid conflicts.
The main solution in the patch was to create the `bool WM_operator_do_navigation(...);` utility that can be used for any operator.

- This patch only affects the transform operators. They are:
- Translation,
- Rotation,
- Resize,
- Skin Resize,
- To Sphere,
- Shear,
- Bend,
- Shrink/Fatten,
- Tilt,
- Trackball,
- Push/Pull,
- Crease,
- Mirror,
- Bone Size,
- Bone Envelope,
- Bone Envelope Distance,
- Curve Shrink/Fatten,
- Mask Shrink/Fatten,
- Grease Pencil Shrink/Fatten,
- Bone Roll,
- Time Translate,
- Time Slide,
- Time Scale,
- Time Extend,
- Bake Time,
- Bevel Weight,
- Align,
- Edge Slide,
- Sequence Slide,
- Grease Pencil Opacity
- This feature affects all editors where transforming is possible (UV, VSE, Graph...)
- The Node editor is the only one that, when canceling, the viewport position is reset
- Navigation is not available when transforming with Release Confirm
- Default modal keymaps need to be edited to avoid conflict (in the patch a temporary operator was implemented to automatically update keymaps)
|Modal Map (Blender):| Conflict: | Current: | New:
|---|---|---|---
| Increase Proportional Influence | VIEW3D_OT_zoom | Wheel Down | Alt Wheel Down
| Decrease Proportional Influence | VIEW3D_OT_zoom | Wheel Up | Alt Wheel Up
| Adjust Proportional Influence | VIEW3D_OT_rotate | Mouse/Trackpad Pan | Alt Mouse/Trackpad Pan
| Increase Max AutoIK Chain Length | VIEW3D_OT_zoom | Wheel Down | Alt Wheel Down
| Decrease Max AutoIK Chain Length | VIEW3D_OT_zoom | Wheel Up | Alt Wheel Up
| Automatic Constraint | VIEW3D_OT_rotate | Middle Mouse | Shift Alt Middle Mouse
| Automatic Constraint Plane | VIEW3D_OT_move | Shift Middle Mouse | Shift Ctrl Alt Middle Mouse

|Modal Map (Industry Compatible):| Conflict: | Current: | New:
|---|---|---|---
| Increase Proportional Influence | VIEW3D_OT_zoom | Wheel Down | Shift Alt Wheel Down
| Decrease Proportional Influence | VIEW3D_OT_zoom | Wheel Up | Shift Alt Wheel Up
| Adjust Proportional Influence | VIEW3D_OT_rotate | Mouse/Trackpad Pan | Alt Mouse/Trackpad Pan
| Select Next Edge Slide Edge | VIEW3D_OT_zoom | Alt Wheel Down | Shift Ctrl Alt Wheel Down
| Select Previous Edge Slide Edge | VIEW3D_OT_zoom | Alt Wheel Up | Shift Ctrl Alt Wheel Up
| Increase Max AutoIK Chain Length | VIEW3D_OT_zoom | Wheel Down | Shift Alt Wheel Down
| Decrease Max AutoIK Chain Length | VIEW3D_OT_zoom | Wheel Up | Shift Alt Wheel Up

|Modal Map (Blender 27x):| Conflict: | Current: | New:
|---|---|---|---
| Increase Proportional Influence | VIEW3D_OT_zoom | Wheel Down | Alt Wheel Down
| Decrease Proportional Influence | VIEW3D_OT_zoom | Wheel Up | Alt Wheel Up
| Increase Proportional Influence | VIEW3D_OT_view_pan | Shift Wheel Down | Shift Alt Wheel Down
| Decrease Proportional Influence | VIEW3D_OT_view_pan | Shift Wheel Up | Shift Alt Wheel Up
| Adjust Proportional Influence | VIEW3D_OT_rotate | Mouse/Trackpad Pan | Alt Mouse/Trackpad Pan
| Increase Max AutoIK Chain Length | VIEW3D_OT_zoom | Wheel Down | Alt Wheel Down
| Decrease Max AutoIK Chain Length | VIEW3D_OT_zoom | Wheel Up | Alt Wheel Up
| Increase Max AutoIK Chain Length | VIEW3D_OT_view_pan | Shift Wheel Down | Shift Alt Wheel Down
| Decrease Max AutoIK Chain Length | VIEW3D_OT_view_pan | Shift Wheel Up | Shift Alt Wheel Up
| Automatic Constraint | VIEW3D_OT_rotate | Middle Mouse | Shift Alt Middle Mouse
| Automatic Constraint Plane | VIEW3D_OT_move | Shift Middle Mouse | Shift Ctrl Alt Middle Mouse

Differential Revision: https://developer.blender.org/D2624