linking: redefine script dependencies

This way of definining dependencies ensures that if we remove one
of the find-* hooks from the config, the rest of them will continue
to work in the expected order. Previously, removing one of them
would break the entire chain.

src/scripts/linking/find-best-target.lua

@@ -13,7 +13,11 @@ log = Log.open_topic ("s-linking")
 
 SimpleEventHook {
   name = "linking/find-best-target",
-  after = "linking/find-default-target",
+  after = { "linking/find-defined-target",
+            "linking/find-filter-target",
+            "linking/find-media-role-target",
+            "linking/find-default-target" },
+  before = "linking/prepare-link",
   interests = {
     EventInterest {
       Constraint { "event.type", "=", "select-target" },

src/scripts/linking/find-default-target.lua

@@ -11,7 +11,10 @@ log = Log.open_topic ("s-linking")
 
 SimpleEventHook {
   name = "linking/find-default-target",
-  after = "linking/find-media-role-target",
+  after = { "linking/find-defined-target",
+            "linking/find-filter-target",
+            "linking/find-media-role-target" },
+  before = "linking/prepare-link",
   interests = {
     EventInterest {
       Constraint { "event.type", "=", "select-target" },

src/scripts/linking/find-defined-target.lua

@@ -15,6 +15,7 @@ log = Log.open_topic ("s-linking")
 
 SimpleEventHook {
   name = "linking/find-defined-target",
+  before = "linking/prepare-link",
   interests = {
     EventInterest {
       Constraint { "event.type", "=", "select-target" },

src/scripts/linking/find-filter-target.lua

@@ -34,6 +34,7 @@ end
 SimpleEventHook {
   name = "linking/find-filter-target",
   after = "linking/find-defined-target",
+  before = "linking/prepare-link",
   interests = {
     EventInterest {
       Constraint { "event.type", "=", "select-target" },

src/scripts/linking/find-media-role-target.lua

@@ -12,7 +12,9 @@ log = Log.open_topic("s-linking")
 
 SimpleEventHook {
   name = "linking/find-media-role-target",
-  after = "linking/find-filter-target",
+  after = { "linking/find-defined-target",
+            "linking/find-filter-target" },
+  before = "linking/prepare-link",
   interests = {
     EventInterest {
       Constraint { "event.type", "=", "select-target" },

src/scripts/linking/get-filter-from-target.lua

@@ -13,7 +13,12 @@ log = Log.open_topic ("s-linking")
 
 SimpleEventHook {
   name = "linking/get-filter-from-target",
-  after = "linking/find-best-target",
+  after = { "linking/find-defined-target",
+            "linking/find-filter-target",
+            "linking/find-media-role-target",
+            "linking/find-default-target",
+            "linking/find-best-target" },
+  before = "linking/prepare-link",
   interests = {
     EventInterest {
       Constraint { "event.type", "=", "select-target" },

src/scripts/linking/prepare-link.lua

@@ -14,7 +14,6 @@ log = Log.open_topic ("s-linking")
 
 SimpleEventHook {
   name = "linking/prepare-link",
-  after = "linking/get-filter-from-target",
   interests = {
     EventInterest {
       Constraint { "event.type", "=", "select-target" },