qt: refactoring and code cleanup in browse model and view

extracted from !5168 (closed)

added MRStatus::Reviewable label

added 2 commits

• 7304459a - qml: separate loading and empty component in BrowseTreeDisplay
• b821a58d - qml: fix focus handling in BrowseTreeHeader

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added Component::Interface: Qt label

changed milestone to %4.0

added MRStatus::InReview label and removed MRStatus::Reviewable label

added 1 commit

• 06d74897 - qml: fix focus handling in BrowseTreeHeader

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added 2 commits

• 877f4f97 - qml: separate loading and empty component in BrowseTreeDisplay
• e29044a1 - qml: fix focus handling in BrowseTreeHeader

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added 2 commits

• bd651cf1 - qml: fix focus handling in BrowseTreeHeader
• e94957ba - qml: fix double padding

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resolved all threads

approved this merge request

added MRStatus::Acceptable label and removed MRStatus::InReview label

added MRStatus::Accepted label and removed MRStatus::Acceptable label

MR Acceptance result

This MergeRequest has been Accepted! Congratulations.

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added 139 commits

• e94957ba...24e663be - 132 commits from branch videolan:master
• 870911a6 - qml: refactor loading view in MainViewLoader for clarity
• ac3b1833 - qml: add more strict constaints for 'loadingComponent'
• 0d955392 - qml: remove redundant property
• 146575c0 - qt: remove shadowed member function
• 0c96e3b6 - qml: separate loading and empty component in BrowseTreeDisplay
• 4149672b - qml: fix focus handling in BrowseTreeHeader
• 4fc045f1 - qml: fix double padding

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enabled an automatic merge when the pipeline for 4fc045f1 succeeds

merged