Update the current line highlight when its color might have changed

Fixes the issue where it would stay the color of the previous color
scheme until you change the cursor position.

src/plugins/texteditor/basetexteditor.h

@@ -526,6 +526,7 @@ private:
     void moveLineUpDown(bool up);
     void copyLineUpDown(bool up);
     void saveCurrentCursorPositionForNavigation();
+    void updateCurrentLineHighlight();
 
     void drawFoldingMarker(QPainter *painter, const QPalette &pal,
                            const QRect &rect,