From ab41de1f744af115886fe272ccff2a5160c1bffa Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Caol=C3=A1n=20McNamara?= <caolanm@redhat.com>
Date: Fri, 25 Sep 2020 11:22:03 +0100
Subject: [PATCH] rhbz#1882616 move cursor one step at a time in the desired
 direction

until we get to the target position. The break iterator operates in graphemes
so we can't just move Left/Right the amount of utf-16 we want to move.

Change-Id: I25d4e9285deae374f85dcaadbf4601bc213a89de
---
 sw/source/core/edit/editsh.cxx | 40 +++++++++++++++++++++++++++++-----
 1 file changed, 35 insertions(+), 5 deletions(-)

diff --git a/sw/source/core/edit/editsh.cxx b/sw/source/core/edit/editsh.cxx
index e4f26588d0af..1e16460f49e2 100644
--- a/sw/source/core/edit/editsh.cxx
+++ b/sw/source/core/edit/editsh.cxx
@@ -983,7 +983,8 @@ OUString SwEditShell::DeleteExtTextInput( bool bInsText )
 
 void SwEditShell::SetExtTextInputData( const CommandExtTextInputData& rData )
 {
-    const SwPosition& rPos = *GetCursor()->GetPoint();
+    SwPaM* pCurrentCursor = GetCursor();
+    const SwPosition& rPos = *pCurrentCursor->GetPoint();
     SwExtTextInput* pInput = GetDoc()->GetExtTextInput( rPos.nNode.GetNode() );
     if( !pInput )
         return;
@@ -1000,10 +1001,39 @@ void SwEditShell::SetExtTextInputData( const CommandExtTextInputData& rData )
     // ugly but works
     ShowCursor();
     const sal_Int32 nDiff = nNewCursorPos - rPos.nContent.GetIndex();
-    if( 0 > nDiff )
-        Left( -nDiff, CRSR_SKIP_CHARS );
-    else if( 0 < nDiff )
-        Right( nDiff, CRSR_SKIP_CHARS );
+    if( nDiff != 0)
+    {
+        bool bLeft = nDiff < 0;
+        sal_Int32 nMaxGuard = std::abs(nDiff);
+        while (true)
+        {
+            auto nOldPos = pCurrentCursor->GetPoint()->nContent.GetIndex();
+            if (bLeft)
+                Left(1, CRSR_SKIP_CHARS);
+            else
+                Right(1, CRSR_SKIP_CHARS);
+            auto nNewPos = pCurrentCursor->GetPoint()->nContent.GetIndex();
+
+            // expected success
+            if (nNewPos == nNewCursorPos)
+                break;
+
+            if (nNewPos == nOldPos)
+            {
+                // if there was no movement, we have failed for some reason
+                SAL_WARN("sw.core", "IM cursor move failed");
+                break;
+            }
+
+            if (--nMaxGuard == 0)
+            {
+                // if it takes more cursor moves than there are utf-16 chars to move past
+                // something has probably gone wrong
+                SAL_WARN("sw.core", "IM abandoning cursor positioning");
+                break;
+            }
+        }
+    }
 
     SetOverwriteCursor( rData.IsCursorOverwrite() );
 
-- 
2.26.2