Print composer opacity no longer working correctly in QGIS 3.4.3; was OK in 3.4.2

[qgib]

Author Name: Mark Evans (Mark Evans)
Original Redmine Issue: 20909
Affected QGIS version: 3.4.3
Redmine category:map_composer/printing

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Task
In Print Composer, selecting any opacity other than 100% for the background of a text box, using Item Properties dialogue.

+Working correctly+
Opacity set from colour selector: Background; Color; Choose Color; Opacity; select value

Result: text box background and frame are displayed with the desired opacity.

+Not working correctly+
Opacity set from rendering: Rendering; select value

Result: Background and frame (if being used) disappear, being replaced by a small rectangular element of the chosen background colour and opacity, but without a border, rendered in the top left corner of the text box for opacity levels below 100%. The small rectangle is not resized with the page zoom i.e. it remains of a constant size whatever the zoom level.

The opacity selection feature worked correctly via both routes in previous releases of QGIS.

[qgib]

Author Name: Giovanni Manghi (@gioman)

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• regression was changed from 0 to 1
• priority_id was changed from Normal to High

[qgib]

Author Name: Nyall Dawson (@nyalldawson)

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Applied in changeset 0de94dd.

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