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Rollover effects

The text rollover effects are well implemented now in the core C code. At present changing the colours for a rollover event in any single text widget will affect all text widgets. So, the next step is to enable unique fg/bg colour combinations.

When using the rollover -tag setting some caution must be used as if any single rollover tag is used repeatedly in a text, then all those separated blocks of text marked with the tag will be highlighted.

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