From 351404deb5d625db7cac66b222e04853a6a077b8 Mon Sep 17 00:00:00 2001
From: Simon Rettberg
Date: Tue, 11 Aug 2020 15:07:57 +0200
Subject: Fix center mode (again)

---
 src/xx.cpp | 45 ++++++++++++++++++++-------------------------
 1 file changed, 20 insertions(+), 25 deletions(-)

diff --git a/src/xx.cpp b/src/xx.cpp
index 1e529ae..aa2f2e0 100644
--- a/src/xx.cpp
+++ b/src/xx.cpp
@@ -508,37 +508,32 @@ ScreenSetup::~ScreenSetup()
 ConfigBackup ScreenSetup::setCenteredClone()
 {
     ConfigBackup retval = createCrtcBackup();
-	XRRModeInfo *fallback = nullptr;
+    XRRModeInfo *fallback = nullptr;
 	for (auto m : a->_modeMap) {
 		if (m->width == 1024 && m->height == 768) {
 			fallback = m;
 			break;
 		}
 	}
-	// See if we even need to do anything
-	for (int i = 0; i < 2; ++i) {
-		int withPref = 0;
-		QSet<RRMode> known;
-		for (auto oi : a->_outputMap) {
-			if (oi->output->npreferred == 0) {
-				if (oi->mode != nullptr) {
-					known.insert(oi->mode->id);
-				}
-			} else {
-				withPref++;
-				known.insert(oi->output->modes[0]);
-			}
-		}
-		if (withPref == 0 && i == 0) {
-			QThread::msleep(100);
-			updateScreenResources();
-			retval = createCrtcBackup();
-			continue;
-		}
-		if (known.count() < 2)
-			return retval;
-		break;
-	}
+    // See if we even need to do anything
+    bool ok = true;
+    unsigned int lX = UINT_MAX, lY = 0;
+    for (auto oi : a->_outputMap) {
+        if (oi->crtc == nullptr)
+            continue;
+        if (oi->crtc->x != 0 || oi->crtc->y != 0) {
+            ok = false; // A screen that's not at origin
+            break;
+        }
+        if (lX != UINT_MAX && (oi->crtc->width != lX || oi->crtc->height != lY)) {
+            ok = false; // Different size than previous screen
+            break;
+        }
+        lX = oi->crtc->width;
+        lY = oi->crtc->height;
+    }
+    if (ok)
+        return retval;
     QStringList cmd;
     QSize screenSize;
 	for (auto oi : a->_outputMap) {
-- 
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