tdf#91641 adjust cursor when deleting preceding characters

IMDeleteSurrounding is used by input methods to take multiple
keystrokes and convert them into a special character.  Then the
composing keystrokes are removed.
Before this fix, the cursor placement was not adjusted,
so the special character was inserted in the wrong position
and if 3+ keystrokes were involved, the wrong characters were deleted.

Also fixes "editLine should have focus on accessibleText init."
The first time an accessibleEdit is created, it didnt recognize any
focused text when editing in the "Input Line".

Change-Id: I5be9b75f74d4df82fbd57da3817a626b5fcbeba1
Reviewed-on: https://gerrit.libreoffice.org/15961Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>
Reviewed-on: https://gerrit.libreoffice.org/16619

sc/source/ui/Accessibility/AccessibleEditObject.cxx

@@ -372,13 +372,21 @@ void ScAccessibleEditObject::CreateTextHelper()
         ::std::unique_ptr< SvxEditSource > pEditSource (new ScAccessibilityEditSource(std::move(pAccessibleTextData)));
         mpTextHelper = new ::accessibility::AccessibleTextHelper(std::move(pEditSource));
         mpTextHelper->SetEventSource(this);
-        mpTextHelper->SetFocus(mbHasFocus);
+
+        const ScInputHandler* pInputHdl = SC_MOD()->GetInputHdl();
+        if ( pInputHdl && pInputHdl->IsEditMode() )
+        {
+            mpTextHelper->SetFocus(true);
+        }
+        else
+        {
+            mpTextHelper->SetFocus(mbHasFocus);
+        }
 
         // #i54814# activate cell in edit mode
         if( meObjectType == CellInEditMode )
         {
             // do not activate cell object, if top edit line is active
-            const ScInputHandler* pInputHdl = SC_MOD()->GetInputHdl();
             if( pInputHdl && !pInputHdl->IsTopMode() )
             {
                 SdrHint aHint( HINT_BEGEDIT );

vcl/unx/gtk/window/gtksalframe.cxx

@@ -4630,7 +4630,7 @@ gboolean GtkSalFrame::IMHandler::signalIMRetrieveSurrounding( GtkIMContext* pCon
     uno::Reference<accessibility::XAccessibleEditableText> xText = lcl_GetxText(pFocusWin);
     if (xText.is())
     {
-        sal_uInt32 nPosition = xText->getCaretPosition();
+        sal_Int32 nPosition = xText->getCaretPosition();
         OUString sAllText = xText->getText();
         OString sUTF = OUStringToOString(sAllText, RTL_TEXTENCODING_UTF8);
         OUString sCursorText(sAllText.copy(0, nPosition));
@@ -4652,7 +4652,7 @@ gboolean GtkSalFrame::IMHandler::signalIMDeleteSurrounding( GtkIMContext*, gint
     uno::Reference<accessibility::XAccessibleEditableText> xText = lcl_GetxText(pFocusWin);
     if (xText.is())
     {
-        sal_uInt32 nPosition = xText->getCaretPosition();
+        sal_Int32 nPosition = xText->getCaretPosition();
         // #i111768# range checking
         sal_Int32 nDeletePos = nPosition + offset;
         sal_Int32 nDeleteEnd = nDeletePos + nchars;
@@ -4664,6 +4664,14 @@ gboolean GtkSalFrame::IMHandler::signalIMDeleteSurrounding( GtkIMContext*, gint
             nDeleteEnd = xText->getCharacterCount();
 
         xText->deleteText(nDeletePos, nDeleteEnd);
+        //tdf91641 adjust cursor if deleted chars shift it forward (normal case)
+        if (nDeletePos < nPosition)
+        {
+            if (nDeleteEnd <= nPosition)
+                xText->setCaretPosition( nPosition-(nDeleteEnd-nDeletePos) );
+            else
+                xText->setCaretPosition( nDeletePos );
+        }
         return true;
     }