Issue #2918761 by quietone, chiranjeeb2410, phenaproxima, maxocub, heddn, alexpott: Break up MigrateUpgradeForm into smaller forms

Issue #2687843 by quietone, heddn, Jo Fitzgerald, alexpott, piggito, mallezie, mikeryan, xjm, phenaproxima, benjifisher, webchick, Gábor Hojtsy, masipila, benjy, abhishek-anand, catch: Add back incremental migrations through the UI

Issue #2922701 by quietone, masipila, heddn, benjifisher, phenaproxima, larowlan, xjm, catch: Migrate UI - refer to modules and add help text

Issue #2914974 by quietone, rakesh.gectcr, maxocub, heddn, Jo Fitzgerald, Yogesh Pawar, masipila, phenaproxima, jhodgdon, Gábor Hojtsy, larowlan, neclimdul: Migrate UI - handle sources that do not need an upgrade

Issue #2908282 by heddn, phenaproxima, Jo Fitzgerald, quietone, xjm, larowlan, mikeryan, dipakmdhrm: Throw exception for source plugins without a source_module property

Issue #2876085 by heddn, maxocub, phenaproxima, Jo Fitzgerald, vasi, quietone, yoroy, masipila, larowlan, neclimdul, krystalcode, catch: Before upgrading, audit for potential ID conflicts

Issue #2859304 by quietone, heddn, Jo Fitzgerald, maxocub, rivimey, phenaproxima, jhodgdon: Show field type migrations correctly in Migrate Drupal UI

Issue #2905227 by maxocub, yoroy, jjpoole, heddn, phenaproxima, vulcanr, quietone, wturrell, xjm: Migrate UI: Improve 'Review Upgrade' page UX

Issue #2908699 by Jo Fitzgerald, heddn, xjm: Several textual and markup improvements to the Migrate Upgrade UI

Issue #2907233 by quietone, madlobz, heddn, maxocub: File migration from D6 to D8 version using Migrate Drupal UI

Issue #2905222 by heddn, edysmp, Jo Fitzgerald, quietone, yoroy, jjpoole: Migrate UI: Initial Screen UX improvements

Issue #2569805 by quietone, Jo Fitzgerald, mikeryan, joelpittet, heddn, Adita, Miguel.kode, iMiksu, tvb, maxocub, juancasantito, phenaproxima, alexpott, neclimdul, xjm: For Drupal migration, identify the source module

Issue #2505283 by quietone, maxocub, Jo Fitzgerald, mikeryan, Pavan B S, penyaskito, chriscalip, phenaproxima: Handle import of private files

Issue #2867304 by maxocub, michielnugter, Jo Fitzgerald, dawehner, quietone: Convert web tests to browser tests for migrate_drupal_ui module

Issue #2422229 by quietone, ultimike, vprocessor, anish.a, Jo Fitzgerald, phenaproxima: D6->D8 Core block migrations missing settings tests

Issue #2600836 by balagan, Sagar Ramgade, Chi, anil280988, joshi.rohit100, Jo Fitzgerald, vaplas, dawehner, alexpott, klausi: Make protected Simpletest test methods public for consistency

Issue #2714497 by Peacog, mangy.fox, riteshsarraf, Sophie.SK: Pre-existing 'book' content type prevents book module installation

Issue #2225775 by vasi, quietone, phenaproxima, chx, penyaskito, mikeryan, esclapes, vprocessor, steinmb, Gábor Hojtsy, Marc Angles, bwinett: Migrate Drupal 6 core node translation to Drupal 8

Issue #2692247 by alexpott, mikeryan: Pre-existing 'forum' content type prevents forum module installation

Issue #2682585 by heddn, dscl, hanoii, willwh, hussainweb: Rename MigrationCreationTrait as it no longer creates migrations - it configures them

Issue #2665992 by alexpott, klausi, heykarthikwithu, xjm, tstoeckler: @file is not required for classes, interfaces and traits

Issue #2625696 by chx, benjy, alexpott, catch, mikeryan, andypost, phenaproxima: Make migrations themselves plugins instead of config entities

Issue #2281691 by xjm, mikeryan, Gábor Hojtsy, alexpott, tim.plunkett, webchick, abhishek-anand, quietone, yoroy, stevepurkiss, benjy, Bojhan, Ryan Weal, aleksip, anavarre, hussainweb, er.pushpinderrana, cilefen, Luukyb, Jo Fitzgerald: User interface for migration-based upgrades