lexer XML: support multi-line quoted strings
Windows+click does the same as simple click, like VSCode
show console error when option 'newdoc_lexer' has wrong lexer name option 'centering_width' in floating groups: ignores grouping mode in main window option 'centering_width' works also in grouping modes '2 horz', '3 horz', '4 horz', '6 horz' option 'centering_width': reworked code, coz we had hard to reproduce bug when option was reset find/replace: show in the statusbar 'border crossed' for wrapped search tab-switcher dialog (Ctrl+Tab): shows the current document too reacts to Ctrl+Shift+Tab too statusbar: removed msg prefix '' but added 'RO' text to the cell 'selmode' instead (cell 'selmode' by default is located just before the last message cell)
