Examples: fixed custom rendering example canvas size.

imgui.cpp

@@ -8174,7 +8174,7 @@ static void ShowExampleAppCustomRendering(bool* opened)
     // However you can draw directly and poll mouse/keyboard by yourself. You can manipulate the cursor using GetCursorPos() and SetCursorPos().
     // If you only use the ImDrawList API, you can notify the owner window of its extends by using SetCursorPos(max) followed by an empty Text("") statement.
     ImVec2 canvas_pos = ImGui::GetCursorScreenPos();            // ImDrawList API uses screen coordinates!
-    ImVec2 canvas_size = ImVec2(ImMin(50.0f,ImGui::GetWindowContentRegionMax().x-ImGui::GetCursorPos().x), ImMin(50.0f,ImGui::GetWindowContentRegionMax().y-ImGui::GetCursorPos().y));    // Resize canvas what's available
+    ImVec2 canvas_size = ImVec2(ImMax(50.0f,ImGui::GetWindowContentRegionMax().x-ImGui::GetCursorPos().x), ImMax(50.0f,ImGui::GetWindowContentRegionMax().y-ImGui::GetCursorPos().y));    // Resize canvas what's available
     draw_list->AddRect(canvas_pos, ImVec2(canvas_pos.x + canvas_size.x, canvas_pos.y + canvas_size.y), 0xFFFFFFFF);
     bool adding_preview = false;
     ImGui::InvisibleButton("canvas", canvas_size);