From f81536e921d23a9ef22dcad91630dd8a8b843a2c Mon Sep 17 00:00:00 2001
From: vintagepc <53943260+vintagepc@users.noreply.github.com>
Date: Tue, 24 Nov 2020 21:47:10 -0500
Subject: [PATCH] Stop WaitForText() check if there is no net change (#286)

---
 parts/components/HD44780.cpp | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/parts/components/HD44780.cpp b/parts/components/HD44780.cpp
index 42142658..05f772de 100644
--- a/parts/components/HD44780.cpp
+++ b/parts/components/HD44780.cpp
@@ -233,8 +233,11 @@ uint32_t HD44780::OnDataReady()
 			{
 				int iPos =m_uiCursor - m_lineOffsets.at(i);
 				std::string &line = m_vLines[i];
-				line[iPos] = m_uiDataPins;
-				m_uiLineChg |= 1U<<i;
+				if (line[iPos] != m_uiDataPins) // Only if the contents change!
+				{
+					line[iPos] = m_uiDataPins;
+					m_uiLineChg |= 1U<<i;
+				}
 			}
 		}
 		TRACE(printf("hd44780_write_data %02x (%c) to %02x\n", m_uiDataPins, m_uiDataPins, m_uiCursor));