Shortcuts: Revert "SetShortcutRouting: require explicit routing. (#456)

This reverts commit a689fa262a.

imgui.cpp

@@ -8679,6 +8679,9 @@ static bool IsKeyChordPotentiallyCharInput(ImGuiKeyChord key_chord)
 bool ImGui::SetShortcutRouting(ImGuiKeyChord key_chord, ImGuiInputFlags flags, ImGuiID owner_id)
 {
     ImGuiContext& g = *GImGui;
+    if ((flags & ImGuiInputFlags_RouteTypeMask_) == 0)
+        flags |= ImGuiInputFlags_RouteGlobal | ImGuiInputFlags_RouteOverFocused | ImGuiInputFlags_RouteOverActive; // 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(owner_id != ImGuiKeyOwner_Any && owner_id != ImGuiKeyOwner_NoOwner);
     if (flags & (ImGuiInputFlags_RouteOverFocused | ImGuiInputFlags_RouteOverActive | ImGuiInputFlags_RouteUnlessBgFocused))

imgui_internal.h

@@ -3264,7 +3264,7 @@ namespace ImGui
     // - 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); // routing policy and owner_id needs to be explicit and cannot be 0
+    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          TestShortcutRouting(ImGuiKeyChord key_chord, ImGuiID owner_id);
     IMGUI_API ImGuiKeyRoutingData* GetShortcutRoutingData(ImGuiKeyChord key_chord);