Fixed random crashing issue

src/imgui/dockspace.cpp

@@ -14,6 +14,7 @@ namespace anm2ed::imgui
 
     auto viewport = ImGui::GetMainViewport();
     auto windowHeight = viewport->Size.y - taskbar.height - documents.height;
+    if (windowHeight < 1.0f) windowHeight = 1.0f;
 
     ImGui::SetNextWindowViewport(viewport->ID);
     ImGui::SetNextWindowPos(ImVec2(viewport->Pos.x, viewport->Pos.y + taskbar.height + documents.height));

src/imgui/window/animation_preview.cpp

@@ -898,14 +898,11 @@ namespace anm2ed::imgui
 
       ImGui::EndPopup();
     }
-    ImGui::End();
 
     manager.progressPopup.trigger();
 
     if (ImGui::BeginPopupModal(manager.progressPopup.label(), &manager.progressPopup.isOpen, ImGuiWindowFlags_NoResize))
     {
-      if (!animation) return;
-
       auto& start = manager.recordingStart;
       auto& end = manager.recordingEnd;
       auto progress = (playback.time - start) / (end - start);
@@ -946,5 +943,6 @@ namespace anm2ed::imgui
     }
 
     settings.previewStartZoom = zoom;
+    ImGui::End();
   }
 }

src/imgui/window/animations.cpp

@@ -466,7 +466,7 @@ namespace anm2ed::imgui
 
         ImGui::EndPopup();
       }
+    }
     ImGui::End();
   }
 }
-}

src/imgui/window/spritesheet_editor.cpp

@@ -518,7 +518,6 @@ namespace anm2ed::imgui
 
       ImGui::EndPopup();
     }
-    ImGui::End();
 
     if (!document.isSpritesheetEditorSet)
     {
@@ -532,5 +531,6 @@ namespace anm2ed::imgui
 
     settings.editorSize = size;
     settings.editorStartZoom = zoom;
+    ImGui::End();
   }
 }

src/imgui/window/welcome.cpp

@@ -14,6 +14,8 @@ namespace anm2ed::imgui
   {
     auto viewport = ImGui::GetMainViewport();
     auto windowHeight = viewport->Size.y - taskbar.height - documents.height;
+    if (windowHeight < 1.0f)
+      windowHeight = 1.0f;
 
     ImGui::SetNextWindowViewport(viewport->ID);
     ImGui::SetNextWindowPos(ImVec2(viewport->Pos.x, viewport->Pos.y + taskbar.height + documents.height));

src/state.cpp

@@ -2,6 +2,8 @@
 
 #include <algorithm>
 
+#include <imgui/imgui_internal.h>
+
 #include <imgui/backends/imgui_impl_opengl3.h>
 #include <imgui/backends/imgui_impl_sdl3.h>