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TTP# 336464 - Editor: Finish the Multiline Editable Text Block Abstracted away the SetEditableText and GetEditableText functions from SMultiLineEditableText into "text marshallers" which handle converting text to and from a TextLayout. There are three types of text marshallers currently implemented: * Plain-text * Rich-text * Syntax highlighting Text marshallers also have the ability to inject formatting "live" (as the text changes), which is how the syntax highlighting marshaller works. Added the ability for a run to query the information it was created with. This allows the rich-text marshaller to reconstruct the original rich-text from the styled runs. To test this out, I've implemented a simple WYSIWYG rich-text editor demo with the following features: * Two SMultiLineEditableText widgets showing the same source text, one using a rich-text marshaller, and one using a syntax highlighter marshaller. * A toolbar to allow you to control the style of the selected text. * A button to allow you to insert a hyperlink into the document. The demo also makes use of the meta-data stored in the runs (the same information used to reconstruct the original rich-text) to read the text style of whatever is currently under the cursor, live, as the cursor is moved. Miscellaneous fixes: * Fixed an issue where deleting text that spanned multiple runs could leave the remaining runs in a bad state, leading to phantom text appearing (see FTextLayout::RemoveAt). * Fixed an issue where new-lines at the end of a rich-text document would be lost (see CalculateLineRanges). * Fixed an issue where \\r\\n line endings werenÆt being handled correctly by the rich-text parser (see CalculateLineRanges). * Fixed an issue where the rich-text parser would treat an empty run as plain-text (see FRichTextMarkupProcessing::ParseLineRanges). * Fixed an issue where inserting a line break when the cursor was at the end of a line containing multiple runs could sometimes fail (see FTextLayout::SplitLineAt). * Fixed mouse cursor movement not working correctly with a FSlateHyperlinkRun (see FSlateHyperlinkRun::GetTextIndexAt). ReviewedBy Justin.Sargent [CL 2246838 by Jamie Dale in Main branch]