SetShortcutRouting: require explicit routing. (#456)

imgui.cpp

diff --git a/imgui.cpp b/imgui.cpp
index 9b74f09..9d71233 100644
--- a/imgui.cpp
+++ b/imgui.cpp
@@ -8662,10 +8662,7 @@
 bool ImGui::SetShortcutRouting(ImGuiKeyChord key_chord, ImGuiInputFlags flags, ImGuiID owner_id)
 {
     ImGuiContext& g = *GImGui;
-    if ((flags & ImGuiInputFlags_RouteTypeMask_) == 0)
-        flags |= ImGuiInputFlags_RouteGlobalHighest; // IMPORTANT: This is the default for SetShortcutRouting() but NOT Shortcut()
-    else
-        IM_ASSERT(ImIsPowerOfTwo(flags & ImGuiInputFlags_RouteTypeMask_)); // Check that only 1 routing flag is used
+    IM_ASSERT(ImIsPowerOfTwo(flags & ImGuiInputFlags_RouteTypeMask_)); // Check that only 1 routing flag is used
     IM_ASSERT(owner_id != ImGuiKeyOwner_Any && owner_id != ImGuiKeyOwner_NoOwner);
 
     // Add ImGuiMod_XXXX when a corresponding ImGuiKey_LeftXXX/ImGuiKey_RightXXX is specified.

imgui_internal.h

diff --git a/imgui_internal.h b/imgui_internal.h
index fa8f2c9..32f479c 100644
--- a/imgui_internal.h
+++ b/imgui_internal.h
@@ -3264,7 +3264,7 @@
     // - You can chain two unrelated windows in the focus stack using SetWindowParentWindowForFocusRoute()
     //   e.g. if you have a tool window associated to a document, and you want document shortcuts to run when the tool is focused.
     IMGUI_API bool          Shortcut(ImGuiKeyChord key_chord, ImGuiInputFlags flags, ImGuiID owner_id);
-    IMGUI_API bool          SetShortcutRouting(ImGuiKeyChord key_chord, ImGuiInputFlags flags, ImGuiID owner_id); // owner_id needs to be explicit and cannot be 0
+    IMGUI_API bool          SetShortcutRouting(ImGuiKeyChord key_chord, ImGuiInputFlags flags, ImGuiID owner_id); // routing policy and owner_id needs to be explicit and cannot be 0
     IMGUI_API bool          TestShortcutRouting(ImGuiKeyChord key_chord, ImGuiID owner_id);
     IMGUI_API ImGuiKeyRoutingData* GetShortcutRoutingData(ImGuiKeyChord key_chord);