FullscreenUI: Untangle Escape button behaviour

Now it doesn't race against Open Pause Menu

src/frontend-common/fullscreen_ui.cpp

@@ -628,6 +628,8 @@ void FullscreenUI::Render()
     GetEditingSettingsInterface()->Save();
     Host::RunOnCPUThread([]() { System::ApplySettings(false); });
   }
+
+  ImGuiFullscreen::ResetCloseMenuIfNeeded();
 }
 
 void FullscreenUI::ReturnToMainWindow()
@@ -2066,7 +2068,7 @@ void FullscreenUI::DrawSettingsWindow()
   {
     ResetFocusHere();
 
-    if (ImGui::IsNavInputTest(ImGuiNavInput_Cancel, ImGuiNavReadMode_Pressed))
+    if (WantsToCloseMenu())
     {
       if (ImGui::IsWindowFocused())
         ReturnToMainWindow();

src/frontend-common/imgui_fullscreen.cpp

@@ -474,18 +474,26 @@ bool ImGuiFullscreen::WantsToCloseMenu()
   // Wait for the Close button to be released, THEN pressed
   if (s_close_button_state == 0)
   {
-    if (!IsCancelButtonPressed())
+    if (ImGui::IsNavInputTest(ImGuiNavInput_Cancel, ImGuiNavReadMode_Pressed))
       s_close_button_state = 1;
   }
   else if (s_close_button_state == 1)
   {
-    if (IsCancelButtonPressed())
+    if (ImGui::IsNavInputTest(ImGuiNavInput_Cancel, ImGuiNavReadMode_Released))
     {
-      s_close_button_state = 0;
-      return true;
+      s_close_button_state = 2;
     }
   }
-  return false;
+  return s_close_button_state > 1;
+}
+
+void ImGuiFullscreen::ResetCloseMenuIfNeeded()
+{
+  // If s_close_button_state reached the "Released" state, reset it after the tick
+  if (s_close_button_state > 1)
+  {
+    s_close_button_state = 0;
+  }
 }
 
 void ImGuiFullscreen::PushPrimaryColor()
@@ -516,11 +524,6 @@ void ImGuiFullscreen::PopSecondaryColor()
   ImGui::PopStyleColor(5);
 }
 
-bool ImGuiFullscreen::IsCancelButtonPressed()
-{
-  return ImGui::IsNavInputTest(ImGuiNavInput_Cancel, ImGuiNavReadMode_Pressed);
-}
-
 bool ImGuiFullscreen::BeginFullscreenColumns(const char* title)
 {
   ImGui::SetNextWindowPos(ImVec2(g_layout_padding_left, 0.0f));
@@ -1639,7 +1642,7 @@ void ImGuiFullscreen::DrawFileSelector()
   ImGui::PushStyleColor(ImGuiCol_TitleBgActive, UIPrimaryColor);
   ImGui::PushStyleColor(ImGuiCol_PopupBg, UIBackgroundColor);
 
-  bool is_open = !IsCancelButtonPressed();
+  bool is_open = !WantsToCloseMenu();
   bool directory_selected = false;
   if (ImGui::BeginPopupModal(s_file_selector_title.c_str(), &is_open,
                              ImGuiWindowFlags_NoCollapse | ImGuiWindowFlags_NoResize | ImGuiWindowFlags_NoMove))
@@ -1759,7 +1762,7 @@ void ImGuiFullscreen::DrawChoiceDialog()
   ImGui::PushStyleColor(ImGuiCol_TitleBgActive, UIPrimaryColor);
   ImGui::PushStyleColor(ImGuiCol_PopupBg, UIBackgroundColor);
 
-  bool is_open = !IsCancelButtonPressed();
+  bool is_open = !WantsToCloseMenu();
   s32 choice = -1;
 
   if (ImGui::BeginPopupModal(s_choice_dialog_title.c_str(), &is_open,

src/frontend-common/imgui_fullscreen.h

@@ -128,14 +128,13 @@ void EndLayout();
 void QueueResetFocus();
 bool ResetFocusHere();
 bool WantsToCloseMenu();
+void ResetCloseMenuIfNeeded();
 
 void PushPrimaryColor();
 void PopPrimaryColor();
 void PushSecondaryColor();
 void PopSecondaryColor();
 
-bool IsCancelButtonPressed();
-
 void DrawWindowTitle(const char* title);
 
 bool BeginFullscreenColumns(const char* title = nullptr);