Nav: Fixed clicking on void from not clearing focused window. Amend d31fe97f7. (#3344, #2880)

This would be problematic e.g. in situation where the application relies on io.WantCaptureKeyboard flag being cleared accordingly.

docs/CHANGELOG.txt

@@ -37,6 +37,9 @@ HOW TO UPDATE?
 
 Other Changes:
 
+- Nav: Fixed clicking on void from not clearing focused window.
+  This would be problematic e.g. in situation where the application relies on io.WantCaptureKeyboard
+  flag being cleared accordingly. (bug introduced in 1.77 WIP on 2020/06/16) (#3344, #2880)
 - InputText, ImDrawList: Fixed assert triggering when drawing single line of text with more
   than ~16 KB characters. (Note that current code is going to show corrupted display if after
   clipping, more than 16 KB characters are visible in the same low-level ImDrawList::RenderText
@@ -62,7 +65,7 @@ Decorated log: https://github.com/ocornut/imgui/releases/tag/v1.77
 Breaking Changes:
 
 - Removed unnecessary ID (first arg) of ImFontAtlas::AddCustomRectRegular() function. Please
-  note that this is a Beta api and will likely be reworked in order to support multi-DPI accross
+  note that this is a Beta api and will likely be reworked in order to support multi-DPI across
   multiple monitors.
 - Renamed OpenPopupOnItemClick() to OpenPopupContextItem(). Kept inline redirection function (will obsolete).
 - Removed BeginPopupContextWindow(const char*, int mouse_button, bool also_over_items) in favor

imgui.cpp

@@ -3367,7 +3367,7 @@ void ImGui::UpdateMouseMovingWindowEndFrame()
                 if (!root_window->TitleBarRect().Contains(g.IO.MouseClickedPos[0]))
                     g.MovingWindow = NULL;
         }
-        else if (root_window != NULL && g.NavWindow != NULL && GetTopMostPopupModal() == NULL)
+        else if (root_window == NULL && g.NavWindow != NULL && GetTopMostPopupModal() == NULL)
         {
             // Clicking on void disable focus
             FocusWindow(NULL);