Fix T63125: Gpencil: bones cannot be selected in weightpaint mode

Some underlying functionality was not ready for greasepencil:
- BKE_modifiers_get_virtual_modifierlist (now introduce dedicated BKE_gpencil_modifiers_get_virtual_modifierlist)
- BKE_modifiers_is_deformed_by_armature
- checks in drawing code
- checks in (pose) selection code

A couple of changes to make this work:
- `eGpencilModifierType_Armature` has to be respected (not only `eModifierType_Armature`)
- `OB_MODE_WEIGHT_GPENCIL` has to be respected (not only `OB_MODE_WEIGHT_PAINT`) --  (now use new `OB_MODE_ALL_WEIGHT_PAINT`)
- `gpencil_weightmode_toggle_exec` now shares functionality from `wpaint_mode_toggle_exec` -- moved to new `ED_object_posemode_set_for_weight_paint`

This patch will also set the context member "weight_paint_object" for greasepencil (otherwise some appropriate pose operators wont work when in weightpaint mode)

Reviewed By: campbellbarton

Maniphest Tasks: T63125

Differential Revision: https://developer.blender.org/D8483

1 files changed, 1 insertions, 1 deletions

diff --git a/source/blender/draw/intern/draw_manager.c b/source/blender/draw/intern/draw_manager.c
index 336a3d61479..6e0ce87b1b8 100644
--- a/source/blender/draw/intern/draw_manager.c
+++ b/source/blender/draw/intern/draw_manager.c
@@ -451,7 +451,7 @@ static void drw_context_state_init(void)
   if (DST.draw_ctx.object_mode & OB_MODE_POSE) {
     DST.draw_ctx.object_pose = DST.draw_ctx.obact;
   }
-  else if (DST.draw_ctx.object_mode & OB_MODE_WEIGHT_PAINT) {
+  else if ((DST.draw_ctx.object_mode & OB_MODE_ALL_WEIGHT_PAINT)) {
     DST.draw_ctx.object_pose = BKE_object_pose_armature_get(DST.draw_ctx.obact);
   }
   else {