Disabled: Added assert guard for mismatching BeginDisabled()/EndDisabled() blocks. (#211) + Added asserts for missing PopItemFlag() calls. Added both to ErrorCheckEndFrameRecover (#1651)

docs/CHANGELOG.txt

@@ -49,6 +49,7 @@ Other Changes:
   an accidental press on NavInput (Triangle button on PS4/PS5) without a wired keyboard. (#2321)
 - TextUnformatted: Accept null ranges including (NULL,NULL) without asserting, in order to conform
   to common idioms (e.g. passing .data(), .data() + .size() from a null string). (#3615)
+- Disabled: Added assert guard for mismatching BeginDisabled()/EndDisabled() blocks. (#211)
 - Nav: Fixed toggling menu layer with Alt or exiting menu layer with Esc not moving mouse when
   the NavEnableSetMousePos config flag is set.
 - Nav: Fixed a few widgets from not setting reference keyboard/gamepad navigation ID when
@@ -66,6 +67,7 @@ Other Changes:
 - Menus: Fixed crash when navigating left inside a child window inside a sub-menu. (#4510).
 - Drag and Drop: Fixed using BeginDragDropSource() inside a BeginChild() that returned false. (#4515)
 - PlotHistogram: Fixed zero-line position when manually specifying min<0 and max>0. (#4349) [@filippocrocchini]
+- Misc: Added asserts for missing PopItemFlag() calls.
 - IO: Added 'io.WantCaptureMouseUnlessPopupClose' alternative to `io.WantCaptureMouse'. (#4480)
   This allows apps to receive the click on void when that click is used to close popup (by default,
   clicking on a void when a popup is open will close the popup but not release io.WantCaptureMouse).

imgui.cpp

@@ -6661,11 +6661,14 @@ void ImGui::BeginDisabled(bool disabled)
     if (was_disabled || disabled)
         g.CurrentItemFlags |= ImGuiItemFlags_Disabled;
     g.ItemFlagsStack.push_back(g.CurrentItemFlags);
+    g.DisabledStackSize++;
 }
 
 void ImGui::EndDisabled()
 {
     ImGuiContext& g = *GImGui;
+    IM_ASSERT(g.DisabledStackSize > 0);
+    g.DisabledStackSize--;
     bool was_disabled = (g.CurrentItemFlags & ImGuiItemFlags_Disabled) != 0;
     //PopItemFlag();
     g.ItemFlagsStack.pop_back();
@@ -7340,11 +7343,21 @@ void    ImGui::ErrorCheckEndFrameRecover(ImGuiErrorLogCallback log_callback, voi
             if (log_callback) log_callback(user_data, "Recovered from missing PopID() in '%s'", window->Name);
             PopID();
         }
+        while (g.DisabledStackSize > window->DC.StackSizesOnBegin.SizeOfDisabledStack)
+        {
+            if (log_callback) log_callback(user_data, "Recovered from missing EndDisabled() in '%s'", window->Name);
+            EndDisabled();
+        }
         while (g.ColorStack.Size > window->DC.StackSizesOnBegin.SizeOfColorStack)
         {
             if (log_callback) log_callback(user_data, "Recovered from missing PopStyleColor() in '%s' for ImGuiCol_%s", window->Name, GetStyleColorName(g.ColorStack.back().Col));
             PopStyleColor();
         }
+        while (g.ItemFlagsStack.Size > window->DC.StackSizesOnBegin.SizeOfItemFlagsStack)
+        {
+            if (log_callback) log_callback(user_data, "Recovered from missing PopItemFlag() in '%s'", window->Name);
+            PopItemFlag();
+        }
         while (g.StyleVarStack.Size > window->DC.StackSizesOnBegin.SizeOfStyleVarStack)
         {
             if (log_callback) log_callback(user_data, "Recovered from missing PopStyleVar() in '%s'", window->Name);
@@ -7385,7 +7398,9 @@ void ImGuiStackSizes::SetToCurrentState()
     SizeOfFontStack = (short)g.FontStack.Size;
     SizeOfFocusScopeStack = (short)g.FocusScopeStack.Size;
     SizeOfGroupStack = (short)g.GroupStack.Size;
+    SizeOfItemFlagsStack = (short)g.ItemFlagsStack.Size;
     SizeOfBeginPopupStack = (short)g.BeginPopupStack.Size;
+    SizeOfDisabledStack = (short)g.DisabledStackSize;
 }
 
 // Compare to detect usage errors
@@ -7403,6 +7418,8 @@ void ImGuiStackSizes::CompareWithCurrentState()
     // For color, style and font stacks there is an incentive to use Push/Begin/Pop/.../End patterns, so we relax our checks a little to allow them.
     IM_ASSERT(SizeOfGroupStack      == g.GroupStack.Size        && "BeginGroup/EndGroup Mismatch!");
     IM_ASSERT(SizeOfBeginPopupStack == g.BeginPopupStack.Size   && "BeginPopup/EndPopup or BeginMenu/EndMenu Mismatch!");
+    IM_ASSERT(SizeOfDisabledStack   == g.DisabledStackSize      && "BeginDisabled/EndDisabled Mismatch!");
+    IM_ASSERT(SizeOfItemFlagsStack  >= g.ItemFlagsStack.Size    && "PushItemFlag/PopItemFlag Mismatch!");
     IM_ASSERT(SizeOfColorStack      >= g.ColorStack.Size        && "PushStyleColor/PopStyleColor Mismatch!");
     IM_ASSERT(SizeOfStyleVarStack   >= g.StyleVarStack.Size     && "PushStyleVar/PopStyleVar Mismatch!");
     IM_ASSERT(SizeOfFontStack       >= g.FontStack.Size         && "PushFont/PopFont Mismatch!");

imgui.h

@@ -64,7 +64,7 @@ Index of this file:
 // Version
 // (Integer encoded as XYYZZ for use in #if preprocessor conditionals. Work in progress versions typically starts at XYY99 then bounce up to XYY00, XYY01 etc. when release tagging happens)
 #define IMGUI_VERSION               "1.85 WIP"
-#define IMGUI_VERSION_NUM           18414
+#define IMGUI_VERSION_NUM           18415
 #define IMGUI_CHECKVERSION()        ImGui::DebugCheckVersionAndDataLayout(IMGUI_VERSION, sizeof(ImGuiIO), sizeof(ImGuiStyle), sizeof(ImVec2), sizeof(ImVec4), sizeof(ImDrawVert), sizeof(ImDrawIdx))
 #define IMGUI_HAS_TABLE
 

imgui_internal.h

@@ -1381,7 +1381,9 @@ struct IMGUI_API ImGuiStackSizes
     short   SizeOfFontStack;
     short   SizeOfFocusScopeStack;
     short   SizeOfGroupStack;
+    short   SizeOfItemFlagsStack;
     short   SizeOfBeginPopupStack;
+    short   SizeOfDisabledStack;
 
     ImGuiStackSizes() { memset(this, 0, sizeof(*this)); }
     void SetToCurrentState();
@@ -1613,9 +1615,10 @@ struct ImGuiContext
     bool                    DragCurrentAccumDirty;
     float                   DragCurrentAccum;                   // Accumulator for dragging modification. Always high-precision, not rounded by end-user precision settings
     float                   DragSpeedDefaultRatio;              // If speed == 0.0f, uses (max-min) * DragSpeedDefaultRatio
-    float                   DisabledAlphaBackup;                // Backup for style.Alpha for BeginDisabled()
     float                   ScrollbarClickDeltaToGrabCenter;    // Distance between mouse and center of grab box, normalized in parent space. Use storage?
-    int                     TooltipOverrideCount;
+    float                   DisabledAlphaBackup;                // Backup for style.Alpha for BeginDisabled()
+    short                   DisabledStackSize;
+    short                   TooltipOverrideCount;
     float                   TooltipSlowDelay;                   // Time before slow tooltips appears (FIXME: This is temporary until we merge in tooltip timer+priority work)
     ImVector<char>          ClipboardHandlerData;               // If no custom clipboard handler is defined
     ImVector<ImGuiID>       MenusIdSubmittedThisFrame;          // A list of menu IDs that were rendered at least once
@@ -1780,6 +1783,7 @@ struct ImGuiContext
         DragCurrentAccum = 0.0f;
         DragSpeedDefaultRatio = 1.0f / 100.0f;
         DisabledAlphaBackup = 0.0f;
+        DisabledStackSize = 0;
         ScrollbarClickDeltaToGrabCenter = 0.0f;
         TooltipOverrideCount = 0;
         TooltipSlowDelay = 0.50f;
@@ -1863,7 +1867,7 @@ struct IMGUI_API ImGuiWindowTempData
     float                   TextWrapPos;            // Current text wrap pos.
     ImVector<float>         ItemWidthStack;         // Store item widths to restore (attention: .back() is not == ItemWidth)
     ImVector<float>         TextWrapPosStack;       // Store text wrap pos to restore (attention: .back() is not == TextWrapPos)
-    ImGuiStackSizes         StackSizesOnBegin;      // Store size of various stacks for asserting
+    ImGuiStackSizes         StackSizesOnBegin;      // Store size of various stacks for asserting // FIXME: Can be moved to ImGuiWindowStackData
 };
 
 // Storage for one window