The .clang-format file is based on the one in ECM except the following style options: - AlwaysBreakBeforeMultilineStrings - BinPackArguments - BinPackParameters - ColumnLimit - BreakBeforeBraces - KeepEmptyLinesAtTheStartOfBlocks
This moves X11 specific code to a better place, which allows us make item rendering code less platform specific and easier to change.