Fixed an integer overflow and div-by-zero in SliderInt() when v_max is INT_MAX (#6675, #6679)

docs/CHANGELOG.txt

@@ -44,6 +44,9 @@ Breaking changes:
 
 Other changes:
 
+- Sliders: Fixed an integer overflow and div-by-zero in SliderInt() when
+  v_max=INT_MAX (#6675, #6679) [@jbarthelmes]
+
 
 -----------------------------------------------------------------------
  VERSION 1.89.8 (Released 2023-08-01)

imgui_widgets.cpp

@@ -2772,14 +2772,14 @@ bool ImGui::SliderBehaviorT(const ImRect& bb, ImGuiID id, ImGuiDataType data_typ
     const ImGuiAxis axis = (flags & ImGuiSliderFlags_Vertical) ? ImGuiAxis_Y : ImGuiAxis_X;
     const bool is_logarithmic = (flags & ImGuiSliderFlags_Logarithmic) != 0;
     const bool is_floating_point = (data_type == ImGuiDataType_Float) || (data_type == ImGuiDataType_Double);
-    const SIGNEDTYPE v_range = (v_min < v_max ? v_max - v_min : v_min - v_max);
+    const float v_range_f = (float)(v_min < v_max ? v_max - v_min : v_min - v_max); // We don't need high precision for what we do with it.
 
     // Calculate bounds
     const float grab_padding = 2.0f; // FIXME: Should be part of style.
     const float slider_sz = (bb.Max[axis] - bb.Min[axis]) - grab_padding * 2.0f;
     float grab_sz = style.GrabMinSize;
-    if (!is_floating_point && v_range >= 0)                                     // v_range < 0 may happen on integer overflows
+    if (!is_floating_point && v_range_f >= 0.0f)                         // v_range_f < 0 may happen on integer overflows
-        grab_sz = ImMax((float)(slider_sz / (v_range + 1)), style.GrabMinSize); // For integer sliders: if possible have the grab size represent 1 unit
+        grab_sz = ImMax(slider_sz / (v_range_f + 1), style.GrabMinSize); // For integer sliders: if possible have the grab size represent 1 unit
     grab_sz = ImMin(grab_sz, slider_sz);
     const float slider_usable_sz = slider_sz - grab_sz;
     const float slider_usable_pos_min = bb.Min[axis] + grab_padding + grab_sz * 0.5f;
@@ -2848,8 +2848,8 @@ bool ImGui::SliderBehaviorT(const ImRect& bb, ImGuiID id, ImGuiDataType data_typ
                 }
                 else
                 {
-                    if ((v_range >= -100.0f && v_range <= 100.0f) || tweak_slow)
+                    if ((v_range_f >= -100.0f && v_range_f <= 100.0f && v_range_f != 0.0f) || tweak_slow)
-                        input_delta = ((input_delta < 0.0f) ? -1.0f : +1.0f) / (float)v_range; // Gamepad/keyboard tweak speeds in integer steps
+                        input_delta = ((input_delta < 0.0f) ? -1.0f : +1.0f) / v_range_f; // Gamepad/keyboard tweak speeds in integer steps
                     else
                         input_delta /= 100.0f;
                 }