All calls that reference an existing Gui window now start with "GuiUpdate" (exception: GuiClose). All other functions are always to be called DURING menu creation and layouting.
The "Margin" property replaces Gui_AddMargin.
find . -type f -name "*.c" -print0 | xargs -0 sed -i 's/CustomGuiOpen/GuiOpen/g'
find . -type f -name "*.c" -print0 | xargs -0 sed -i 's/CustomGuiClose/GuiClose/g'
find . -type f -name "*.c" -print0 | xargs -0 sed -i 's/CustomGuiSetTag/GuiUpdateTag/g'
find . -type f -name "*.c" -print0 | xargs -0 sed -i 's/CustomGuiUpdate/GuiUpdate/g'
find . -type f -name "*.c" -print0 | xargs -0 sed -i 's/Gui_AddCloseButton/GuiAddCloseButton/g'
find . -type f -name "*.c" -print0 | xargs -0 sed -i 's/Gui_UpdateText/GuiUpdateText/g'
find . -type f -name "*.c" -print0 | xargs -0 sed -i 's/Gui_AddSubwindow/GuiAddSubwindow/g'
When the array is not copied, it can under some circumstances be manipulated in DoMenuRefresh when it is called the next time from another location than the contents-update-effect. The effect does not want the array to change, though.
The property can be used to give GUI windows a margin. Either the same margin in all directions (Margin = "1em") or different margins (Margin = ["1em", "2em", "10$", "0.5em"] - [left, top, right, bottom]).
Before you'd define the X coordinate of the top-left corner of a window with X = [500, -40], now you do Left = "50%-4em". The em values currently do not scale with font-size yet, but it is important to do the formal change as early as possible to not have to do all work twice. Scaling of font and thus menus can be implemented later.
This should reduce the confusion about why the function behaves so differently from Gui_Open: the style objects only provide an interface for those easy GUIs, they are not really part of the GUI system.
David Dormagen