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620542b055
InputText: checks whether provided content can be given back unaltered, which may not be the case after it is splitted to UTF8 chars if the text is binary content. Prevent editing text if that is the case. Adds InputText and InputDialog :isEditable() and :isEdited() methods. Also accounts for the scrollbar width when measuring text to prevent it from being displayed when not needed. Also ensure a minimal size of the scrollbar thumb so it is rendered when huge text with many lines is displayed. Virtual keyboard: Hold on Backspace: delete from cursor to start of line instead of clearing all text content.