TextEditor: Initialize some members

Coverity was complaining about these, in some places even rightly so:-)

Change-Id: Ia85cdd2c74f05edba6f0d4534aa9f2ee2a750595
Reviewed-by: David Schulz <david.schulz@qt.io>

src/plugins/texteditor/texteditor.cpp

@@ -245,7 +245,7 @@ class BaseTextEditorPrivate
 public:
     BaseTextEditorPrivate() {}
 
-    TextEditorFactoryPrivate *m_origin;
+    TextEditorFactoryPrivate *m_origin = nullptr;
 };
 
 class HoverHandlerRunner
@@ -561,7 +561,7 @@ public:
     void disableBlockSelection(BlockSelectionUpdateKind kind);
     void resetCursorFlashTimer();
     QBasicTimer m_cursorFlashTimer;
-    bool m_cursorVisible;
+    bool m_cursorVisible = true;
     bool m_moveLineUndoHack = false;
 
     QTextCursor m_findScopeStart;