[QGIS-Developer] Vocabulary learning: Dissolve vs Merge

[DelazJ]

Hi,

In QGIS, there's the "Dissolve" algorithm [1] and in the advanced
digitizing tools, there's the "Merge selected features" [2]. Both afaics do
the same thing: replace input features by a single one whose geometry
represents the combination of their geometries. No statistics is performed
by default though the digitizing tool gives these options.

Questions:
* Why using two different words, making it hard for those not getting the
subtleties either to describe these features (trying to avoid the reuse of
the other word) and to translate them?
* Are there differences between these terms (and their effects) I'd have
missed?
* Any chance of homogenisation?

[1]
https://docs.qgis.org/testing/en/docs/user_manual/processing_algs/qgis/vectorgeometry.html#dissolve
[2]
https://docs.qgis.org/testing/en/docs/user_manual/working_with_vector/editing_geometry_attributes.html#merge-selected-features

Regards,
Harrissou
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