Internal: Added owner aware variant of IsMouseDoubleClicked() for consistency.

Amend 4448d97. Note that functions entry points will eventually be merged into one, so this is not a problem.
diff --git a/imgui.cpp b/imgui.cpp
index ec80842..acf6bc6 100644
--- a/imgui.cpp
+++ b/imgui.cpp
@@ -8490,6 +8490,13 @@
     return g.IO.MouseClickedCount[button] == 2 && TestKeyOwner(MouseButtonToKey(button), ImGuiKeyOwner_Any);
 }
 
+bool ImGui::IsMouseDoubleClicked(ImGuiMouseButton button, ImGuiID owner_id)
+{
+    ImGuiContext& g = *GImGui;
+    IM_ASSERT(button >= 0 && button < IM_ARRAYSIZE(g.IO.MouseDown));
+    return g.IO.MouseClickedCount[button] == 2 && TestKeyOwner(MouseButtonToKey(button), owner_id);
+}
+
 int ImGui::GetMouseClickedCount(ImGuiMouseButton button)
 {
     ImGuiContext& g = *GImGui;
diff --git a/imgui_internal.h b/imgui_internal.h
index 3671f9c..83af973 100644
--- a/imgui_internal.h
+++ b/imgui_internal.h
@@ -3129,6 +3129,7 @@
     IMGUI_API bool              IsMouseDown(ImGuiMouseButton button, ImGuiID owner_id);
     IMGUI_API bool              IsMouseClicked(ImGuiMouseButton button, ImGuiID owner_id, ImGuiInputFlags flags = 0);
     IMGUI_API bool              IsMouseReleased(ImGuiMouseButton button, ImGuiID owner_id);
+    IMGUI_API bool              IsMouseDoubleClicked(ImGuiMouseButton button, ImGuiID owner_id);
 
     // [EXPERIMENTAL] Shortcut Routing
     // - ImGuiKeyChord = a ImGuiKey optionally OR-red with ImGuiMod_Alt/ImGuiMod_Ctrl/ImGuiMod_Shift/ImGuiMod_Super.