Nav: Fixed a tap on AltGR (e.g. German keyboard) from navigation to the menu layer. (follow and extend on e.g #369, #370)

docs/CHANGELOG.txt

@@ -35,6 +35,7 @@ HOW TO UPDATE?
 
 Other Changes:
 
+- Nav: Fixed a tap on AltGR (e.g. German keyboard) from navigation to the menu layer.
 - InputInt, InputFloat, InputScalar: Fix to keep the label of the +/- buttons centered when
   style.FramePadding.x is abnormally larger than style.FramePadding.y. Since the buttons are
   meant to be square (to align with e.g. color button) we always use FramePadding.y. (#2367)

imgui.cpp

@@ -7591,9 +7591,12 @@ static void ImGui::NavUpdate()
         NAV_MAP_KEY(ImGuiKey_RightArrow,ImGuiNavInput_KeyRight_);
         NAV_MAP_KEY(ImGuiKey_UpArrow,   ImGuiNavInput_KeyUp_   );
         NAV_MAP_KEY(ImGuiKey_DownArrow, ImGuiNavInput_KeyDown_ );
-        if (g.IO.KeyCtrl)   g.IO.NavInputs[ImGuiNavInput_TweakSlow] = 1.0f;
-        if (g.IO.KeyShift)  g.IO.NavInputs[ImGuiNavInput_TweakFast] = 1.0f;
-        if (g.IO.KeyAlt)    g.IO.NavInputs[ImGuiNavInput_KeyMenu_]  = 1.0f;
+        if (g.IO.KeyCtrl)
+            g.IO.NavInputs[ImGuiNavInput_TweakSlow] = 1.0f;
+        if (g.IO.KeyShift)
+            g.IO.NavInputs[ImGuiNavInput_TweakFast] = 1.0f;
+        if (g.IO.KeyAlt && !g.IO.KeyCtrl) // AltGR is Alt+Ctrl, also even on keyboards without AltGR we don't want Alt+Ctrl to open menu.
+            g.IO.NavInputs[ImGuiNavInput_KeyMenu_]  = 1.0f;
         #undef NAV_MAP_KEY
     }
     memcpy(g.IO.NavInputsDownDurationPrev, g.IO.NavInputsDownDuration, sizeof(g.IO.NavInputsDownDuration));