InputScalar: fixed not parsing user input when the display format is configured not to show the scalar value. (#9385)

Useful e.g. for displaying "mixed" inputs, where a single field might represent multiple different values.

imgui_widgets.cpp

@@ -2375,12 +2375,17 @@ bool ImGui::DataTypeApplyFromText(const char* buf, ImGuiDataType data_type, void
 
     // Sanitize format
     // - For float/double we have to ignore format with precision (e.g. "%.2f") because sscanf doesn't take them in, so force them into %f and %lf
-    // - In theory could treat empty format as using default, but this would only cover rare/bizarre case of using InputScalar() + integer + format string without %.
     char format_sanitized[32];
     if (data_type == ImGuiDataType_Float || data_type == ImGuiDataType_Double)
+    {
         format = type_info->ScanFmt;
+    }
     else
+    {
         format = ImParseFormatSanitizeForScanning(format, format_sanitized, IM_COUNTOF(format_sanitized));
+        if (format[0] == '\0')
+            format = type_info->ScanFmt; // Format doesn't want us to show the number currently, but we still need to parse the resulting input
+    }
 
     // Small types need a 32-bit buffer to receive the result from scanf()
     int v32 = 0;