mark-to-column: window-specific variable

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Epsilon User's Manual and Reference > Variable Reference >

mark-to-column: window-specific variable

Default value: -1

The window-specific mark-to-column variable lets you position the mark in a part of a window where there are no characters. Epsilon uses this variable when it displays a region that runs to the mark's position. It's normally -1, so Epsilon highlights up to the actual buffer position of the mark. If it's non-negative in the current window, Epsilon highlights up to the specified column instead. Epsilon resets mark-to-column to -1 whenever the buffer changes, or the mark moves from where it was when you last set mark-to-column. (Epsilon only checks these conditions when it redisplays the window, so you can safely move the mark temporarily.)

More info:

Character Widths and Columns (Primitives)

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