Made IsWindowFocused() work outside of NewFrame()-EndFrame() and added comments about how ImGuiFocusedFlags_AnyWindow should NOT be used in place of io.WantCaptureMouse. (#2185)

imgui.cpp

@@ -5642,11 +5642,11 @@ bool ImGui::IsWindowHovered(ImGuiHoveredFlags flags)
 bool ImGui::IsWindowFocused(ImGuiFocusedFlags flags)
 {
     ImGuiContext& g = *GImGui;
-    IM_ASSERT(g.CurrentWindow);     // Not inside a Begin()/End()
 
     if (flags & ImGuiFocusedFlags_AnyWindow)
         return g.NavWindow != NULL;
 
+    IM_ASSERT(g.CurrentWindow);     // Not inside a Begin()/End()
     switch (flags & (ImGuiFocusedFlags_RootWindow | ImGuiFocusedFlags_ChildWindows))
     {
     case ImGuiFocusedFlags_RootWindow | ImGuiFocusedFlags_ChildWindows:

imgui.h

@@ -732,7 +732,7 @@ enum ImGuiFocusedFlags_
     ImGuiFocusedFlags_None                          = 0,
     ImGuiFocusedFlags_ChildWindows                  = 1 << 0,   // IsWindowFocused(): Return true if any children of the window is focused
     ImGuiFocusedFlags_RootWindow                    = 1 << 1,   // IsWindowFocused(): Test from root window (top most parent of the current hierarchy)
-    ImGuiFocusedFlags_AnyWindow                     = 1 << 2,   // IsWindowFocused(): Return true if any window is focused
+    ImGuiFocusedFlags_AnyWindow                     = 1 << 2,   // IsWindowFocused(): Return true if any window is focused. Important: If you are trying to tell how to dispatch your low-level inputs, do NOT use this. Use ImGui::GetIO().WantCaptureMouse instead.
     ImGuiFocusedFlags_RootAndChildWindows           = ImGuiFocusedFlags_RootWindow | ImGuiFocusedFlags_ChildWindows
 };