From 13207910528e2f553f3f875503b20f104941d958 Mon Sep 17 00:00:00 2001
From: Ingo Weyrich <heckflosse67@gmx.de>
Date: Sat, 27 Jul 2019 11:40:01 +0200
Subject: [PATCH] Backwards thumbnail selection using Shift-key unexpectedly
 shifts starting point of selection, fixes #5389

---
 rtgui/thumbbrowserbase.cc | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/rtgui/thumbbrowserbase.cc b/rtgui/thumbbrowserbase.cc
index 8392e1b61..dba5390c1 100644
--- a/rtgui/thumbbrowserbase.cc
+++ b/rtgui/thumbbrowserbase.cc
@@ -178,15 +178,19 @@ void ThumbBrowserBase::selectRange (ThumbBrowserEntryBase* clicked, bool additio
     if (!additional || !lastClicked) {
         // Extend the current range w.r.t to first selected entry.
         ThumbIterator front = std::find(fd.begin(), fd.end(), selected.front());
+        ThumbIterator back;
         ThumbIterator current = std::find(fd.begin(), fd.end(), clicked);
 
         if (front > current) {
-            std::swap(front, current);
+            front = current;
+            back = std::find(fd.begin(), fd.end(), selected.back());
+        } else {
+            back = current;
         }
 
         clearSelection(selected);
 
-        for (; front <= current && front != fd.end(); ++front) {
+        for (; front <= back && front != fd.end(); ++front) {
             addToSelection(*front, selected);
         }
     } else {