move Freeze() and Thaw() to wxWindowBase to ensure that they behave consistently (i.e. recursively, as described in the docs) in all ports; removed different duplications of freeze count from derived classes
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@51018 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
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@@ -728,7 +728,8 @@ subwindows.
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Freezes the window or, in other words, prevents any updates from taking place
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on screen, the window is not redrawn at all. \helpref{Thaw}{wxwindowthaw} must
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be called to reenable window redrawing. Calls to these two functions may be
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nested.
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nested but to ensure that the window is properly repainted again, you must thaw
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it exactly as many times as you froze it.
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This method is useful for visual appearance optimization (for example, it
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is a good idea to use it before doing many large text insertions in a row into
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