Index under- shooting.

Fix for arc 1D to 2D mapping.
UI segment 2D mapping fix.
Watchdog reposition & flicker reduction.

wled00/wled.cpp

@@ -219,6 +219,7 @@ void WLED::loop()
 
 #if WLED_WATCHDOG_TIMEOUT > 0
   // we finished our mainloop, reset the watchdog timer
+  if (!strip.isUpdating())
   #ifdef ARDUINO_ARCH_ESP32
     esp_task_wdt_reset();
   #else
@@ -280,8 +281,6 @@ void WLED::setup()
   DEBUG_PRINT(F("heap "));
   DEBUG_PRINTLN(ESP.getFreeHeap());
 
-  enableWatchdog();
-
   #if defined(ARDUINO_ARCH_ESP32) && defined(WLED_USE_PSRAM)
   if (psramFound()) {
     // GPIO16/GPIO17 reserved for SPI RAM
@@ -406,6 +405,8 @@ void WLED::setup()
   // HTTP server page init
   initServer();
 
+  enableWatchdog();
+
   #if defined(ARDUINO_ARCH_ESP32) && defined(WLED_DISABLE_BROWNOUT_DET)
   WRITE_PERI_REG(RTC_CNTL_BROWN_OUT_REG, 1); //enable brownout detector
   #endif