Tweak epubreadermenu for X3 device

src/activities/reader/EpubReaderMenuActivity.cpp

@@ -1,6 +1,7 @@
 #include "EpubReaderMenuActivity.h"
 
 #include <GfxRenderer.h>
+#include <HalGPIO.h>
 #include <I18n.h>
 
 #include "KOReaderCredentialStore.h"
@@ -233,5 +234,10 @@ void EpubReaderMenuActivity::render(RenderLock&&) {
   const auto labels = mappedInput.mapLabels(tr(STR_BACK), tr(STR_SELECT), tr(STR_DIR_UP), tr(STR_DIR_DOWN));
   GUI.drawButtonHints(renderer, labels.btn1, labels.btn2, labels.btn3, labels.btn4);
 
-  renderer.displayBuffer();
+  if (gpio.deviceIsX3() && !initialHalfRefreshDone) {
+    initialHalfRefreshDone = true;
+    renderer.displayBuffer(HalDisplay::HALF_REFRESH);
+  } else {
+    renderer.displayBuffer();
+  }
 }

src/activities/reader/EpubReaderMenuActivity.h

@@ -62,6 +62,7 @@ class EpubReaderMenuActivity final : public MenuListActivity {
   int8_t pendingEmbeddedStyleOverride = -1;
   int8_t pendingImageRenderingOverride = -1;
   uint8_t pendingTextDarkness = 1;
+  bool initialHalfRefreshDone = false;
 
   static constexpr const char* pageTurnLabels[] = {"", "1", "3", "6", "12"};