Changing a categorized symbol should not change the [change] widget symbol

[qgib]

Author Name: Harrissou Santanna (@DelazJ)
Original Redmine Issue: 17902
Affected QGIS version: 2.18.15
Redmine category:symbology

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Open vector layer properties --> Style --> Categorized style
Do the classification
Double-clic on one category symbol
change and apply
In the Layer properties dialog, the [Change] button at the top of the dialog has its symbol changed and synced with the new one. This should not be. afaik, this buttonis supposed to rule the symbol of categories and not the inverse.

This also applies to graduated style.
Concerns 2.18.16 and master (worked in 2.14)

[qgib]

Author Name: Harrissou Santanna (@DelazJ)

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PR at #5976

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• pull_request_patch_supplied was changed from 0 to 1

[qgib]

Author Name: Giovanni Manghi (@gioman)

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• priority_id was changed from Normal to High

[qgib]

Author Name: Harrissou Santanna (@DelazJ)

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Applied in changeset 89c2b4b.

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• done_ratio was changed from 0 to 100
• status_id was changed from Open to Closed