Fix editing of text containing surrogate characters.

This relates to issue #162.

Signed-off-by: Michele Calgaro <michele.calgaro@yahoo.it>
(cherry picked from commit 9c648bea9bfb1113c070a05b36f78ff006d0877a)

2 files changed, 25 insertions, 5 deletions

diff --git a/src/widgets/qlineedit.cpp b/src/widgets/qlineedit.cpp
index bcf9b2d0d..eba3f6b20 100644
--- a/src/widgets/qlineedit.cpp
+++ b/src/widgets/qlineedit.cpp
@@ -877,10 +877,18 @@ void TQLineEdit::backspace()
     if ( d->hasSelectedText() ) {
 	d->removeSelectedText();
     } else if ( d->cursor ) {
+	--d->cursor;
+	if ( d->maskData ) {
+	    d->cursor = d->prevMaskBlank( d->cursor );
+	}
+	// second half of a surrogate, check if we have the first half as well,
+	// if yes delete both at once
+	if (d->cursor > 0 && d->text.at(d->cursor).isLowSurrogate() &&
+	        d->text.at(d->cursor - 1).isHighSurrogate()) {
+	    d->del(true);
 	    --d->cursor;
-	    if ( d->maskData )
-		d->cursor = d->prevMaskBlank( d->cursor );
-	    d->del( TRUE );
+	}
+	d->del(true);
     }
     d->finishChange( priorState );
 }
diff --git a/src/widgets/qtextedit.cpp b/src/widgets/qtextedit.cpp
index bac58af15..73e800be8 100644
--- a/src/widgets/qtextedit.cpp
+++ b/src/widgets/qtextedit.cpp
@@ -1783,8 +1783,20 @@ void TQTextEdit::doKeyboardAction( KeyboardAction action )
 		    undoRedoInfo.index = cursor->index();
 		    undoRedoInfo.d->text = TQString::null;
 		}
-		undoRedoInfo.d->text.insert( 0, cursor->paragraph()->at( cursor->index()-1 ), TRUE );
-		undoRedoInfo.index = cursor->index()-1;
+		int cur_idx = cursor->index();
+		const TQTextParagraph *para = cursor->paragraph();
+		if (para->at(cur_idx - 1)->c.isLowSurrogate() && cur_idx > 1 &&
+		       para->at(cur_idx - 2)->c.isHighSurrogate())
+		{
+		    undoRedoInfo.d->text.insert( 0, para->at(cur_idx - 1), TRUE );
+		    undoRedoInfo.d->text.insert( 0, para->at(cur_idx - 2), TRUE );
+		    undoRedoInfo.index = cursor->index() - 2;
+		}
+		else
+		{
+		    undoRedoInfo.d->text.insert( 0, para->at(cur_idx - 1), TRUE );
+		    undoRedoInfo.index = cursor->index() - 1;
+		}
 	    }
 	    cursor->removePreviousChar();
 	    lastFormatted = cursor->paragraph();