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Update FAQ.md (#7581)

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docs/FAQ.md
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@ -204,6 +204,37 @@ ctx->RSSetScissorRects(1, &r);
### Q: How can I have multiple widgets with the same label?
### Q: How can I have multiple windows with the same label?
**USING THE SAME LABEL+ID IS THE MOST COMMON USER MISTAKE:**
<table>
<tr>
<td><img src="https://github.com/ocornut/imgui/assets/8225057/76eb9467-74d1-4e95-9f56-be81c6dd029d"></td>
<td>
<pre lang="cpp">
ImGui::Begin("Incorrect!");
ImGui::DragFloat2("My value", &objects[0]->pos.x);
ImGui::DragFloat2("My value", &objects[1]->pos.x);
ImGui::DragFloat2("My value", &objects[2]->pos.x);
ImGui::End();
&nbsp;
ImGui::Begin("Correct!");
ImGui::DragFloat2("My value", &objects[0]->pos.x);
ImGui::DragFloat2("My value##2", &objects[1]->pos.x);
ImGui::DragFloat2("My value##3", &objects[2]->pos.x);
ImGui::End();
&nbsp;
ImGui::Begin("Also Correct!");
for (int n = 0; n < 3; n++)
{
ImGui::PushID(n);
ImGui::DragFloat2("My value", &objects[n]->pos.x);
ImGui::PopID();
}
ImGui::End();
</pre>
</td>
</tr>
</table>
A primer on labels and the ID Stack...
Dear ImGui internally needs to uniquely identify UI elements.