Forces buffer to analyze and highlight the given area synchronously.
**Note**:
This is a potentially slow operation and should be used only when you need to make sure that some text not currently visible is highlighted, for instance before printing.
start of the area to highlight.
end of the area to highlight.
Forces buffer to analyze and highlight the given area synchronously.
**Note**:
This is a potentially slow operation and should be used only when you need to make sure that some text not currently visible is highlighted, for instance before printing.