flFlags (ULONG)

Flags governing interpretation of dimensions.

MLFFMTRECT_MATCHWINDOW

The dimensions of the format rectangle are always to be kept the same as the window size minus the margins. This causes the MLE implicitly to do a MLM_SETFORMATRECT each time the window is resized, and effectively causes any other dimensions to be ignored. Resizing of the window can cause this setting to be automatically negated (see MLN_OVERFLOW).
MLFFMTRECT_LIMITHORZ
The width of any line in the MLE cannot exceed the given horizontal dimension. If word-wrap is on, this limit has no effect. Word-wrap can result in trailing blanks beyond the right limit. These do not cause an overflow notification.
MLFFMTRECT_LIMITVERT
The vertical height of the total text, as displayed, is limited to that which fits totally within the vertical dimension of the format rectangle.

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