Misc: Fix MSVC warnings

C4573: the usage of 'QObject::connect' requires the compiler to capture 'this' but the current default capture mode does not allow it

and implicit conversions from size_t to int

Change-Id: If9b4ba3103cadd5b2a38ba7072d05aa1488a87bb
Reviewed-by: André Hartmann <aha_1980@gmx.de>
Reviewed-by: hjk <hjk@qt.io>

src/plugins/git/giteditor.cpp

@@ -66,7 +66,7 @@ class GitLogFilterWidget : public QToolBar
 public:
     GitLogFilterWidget(GitEditorWidget *editor)
     {
-        auto addLineEdit = [](const QString &placeholder,
+        auto addLineEdit = [this](const QString &placeholder,
                 const QString &tooltip,
                 GitEditorWidget *editor)
         {