[AVR] Fix last column of last row of DBLSIZE text (off-by-one error)

radio/src/gui/9X/lcd.cpp

@@ -1181,7 +1181,7 @@ void lcd_putcAtt(coord_t x, uint8_t y, const unsigned char c, LcdFlags flags)
         b1 = ~b1;
         b2 = ~b2;
       }
-      if(&p[LCD_W+1] < DISPLAY_END) {
+      if(p+LCD_W < DISPLAY_END) {
         ASSERT_IN_DISPLAY(p);
         ASSERT_IN_DISPLAY(p+LCD_W);
         LCD_BYTE_FILTER(p, 0, b1);

radio/src/tests/lcd.cpp

@@ -174,6 +174,13 @@ TEST(Lcd, Line_Wrap)
   EXPECT_TRUE(checkScreenshot("line_wrap"));
 }
 
+TEST(Lcd, DblsizeBottomRight)
+{
+  lcd_clear();
+  lcd_putsAtt(LCD_W-20, LCD_H-16, "TEST", DBLSIZE);
+  EXPECT_TRUE(checkScreenshot("dblsize_bottom_right"));
+}
+
 #if defined(CPUARM)
 TEST(Lcd, Smlsize_putsStrIdx)
 {