NLA: improve visibility of action & active channel

Selecting Action channel in NLA now sets the context in the N-panel. The
actively selected channel is now also drawn in a different way, so that
it's visible which one is selected.

Old:
- The NLA sidebar didn't refresh with the creation of a new action.
- There was no indication of the action channel being selected.

New:
- NLA side bar now refreshed when keyframes are added (new action is created)
- Clicking on the action channel now gives visual indication of being selected

Reviewed By: RiggingDojo, sybren

Maniphest Tasks: T97372

Differential Revision: https://developer.blender.org/D14820

source/blender/editors/animation/anim_channels_defines.c

@@ -4020,6 +4020,8 @@ static bool acf_nlaaction_setting_valid(bAnimContext *UNUSED(ac),
       else {
         return false;
       }
+    case ACHANNEL_SETTING_SELECT: /* selected */
+      return true;
 
     /* unsupported */
     default:
@@ -4040,6 +4042,9 @@ static int acf_nlaaction_setting_flag(bAnimContext *UNUSED(ac),
       *neg = true;                /* XXX */
       return ADT_NLA_EDIT_NOMAP;
 
+    case ACHANNEL_SETTING_SELECT: /* selected */
+      return ADT_UI_SELECTED;
+
     default: /* unsupported */
       return 0;
   }

source/blender/editors/animation/anim_channels_edit.c

@@ -125,6 +125,7 @@ void ANIM_set_active_channel(bAnimContext *ac,
       case ANIMTYPE_DSHAIR:
       case ANIMTYPE_DSPOINTCLOUD:
       case ANIMTYPE_DSVOLUME:
+      case ANIMTYPE_NLAACTION:
       case ANIMTYPE_DSSIMULATION: {
         /* need to verify that this data is valid for now */
         if (ale->adt) {
@@ -182,6 +183,7 @@ void ANIM_set_active_channel(bAnimContext *ac,
       case ANIMTYPE_DSHAIR:
       case ANIMTYPE_DSPOINTCLOUD:
       case ANIMTYPE_DSVOLUME:
+      case ANIMTYPE_NLAACTION:
       case ANIMTYPE_DSSIMULATION: {
         /* need to verify that this data is valid for now */
         if (ale && ale->adt) {
@@ -199,7 +201,6 @@ void ANIM_set_active_channel(bAnimContext *ac,
       /* unhandled currently, but may be interesting */
       case ANIMTYPE_MASKLAYER:
       case ANIMTYPE_SHAPEKEY:
-      case ANIMTYPE_NLAACTION:
         break;
 
       /* other types */
@@ -312,6 +313,7 @@ static eAnimChannels_SetFlag anim_channels_selection_flag_for_toggle(const ListB
       case ANIMTYPE_DSHAIR:
       case ANIMTYPE_DSPOINTCLOUD:
       case ANIMTYPE_DSVOLUME:
+      case ANIMTYPE_NLAACTION:
       case ANIMTYPE_DSSIMULATION: {
         if ((ale->adt) && (ale->adt->flag & ADT_UI_SELECTED)) {
           return ACHANNEL_SETFLAG_CLEAR;
@@ -339,7 +341,7 @@ static void anim_channels_select_set(bAnimContext *ac,
                                      eAnimChannels_SetFlag sel)
 {
   bAnimListElem *ale;
-
+  
   for (ale = anim_data.first; ale; ale = ale->next) {
     switch (ale->type) {
       case ANIMTYPE_SCENE: {
@@ -420,6 +422,7 @@ static void anim_channels_select_set(bAnimContext *ac,
       case ANIMTYPE_DSHAIR:
       case ANIMTYPE_DSPOINTCLOUD:
       case ANIMTYPE_DSVOLUME:
+      case ANIMTYPE_NLAACTION:
       case ANIMTYPE_DSSIMULATION: {
         /* need to verify that this data is valid for now */
         if (ale->adt) {

source/blender/editors/space_nla/nla_buttons.c

@@ -107,6 +107,7 @@ bool nla_panel_context(const bContext *C,
         found = 1;
         break;
       }
+      case ANIMTYPE_NLAACTION:
       case ANIMTYPE_SCENE: /* Top-Level Widgets doubling up as datablocks */
       case ANIMTYPE_OBJECT:
       case ANIMTYPE_DSMAT: /* Datablock AnimData Expanders */