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BB 43338: Backport fixes to text-only zoom and PDFs

Pier Angelo Vendrame requested to merge pierov/tor-browser:bug_43338-zoom-backports into tor-browser-128.5.0esr-14.5-1

Merge Info

Issues

Resolves

Related

  • tor-browser#xxxxx
  • mullvad-browser#xxxxx
  • tor-browser-build#xxxxx

Merging

Target Branches

  • tor-browser - !fixups to tor-browser-specific commits, new features, security backports
  • base-browser and mullvad-browser - !fixups to base-browser-specific commits, new features to be shared with mullvad-browser, and security backports
    • ⚠️ IMPORTANT: Please list the base-browser-specific commits which need to be cherry-picked to the base-browser and mullvad-browser branches here

Target Channels

  • Alpha: esr128-14.5
  • Stable: esr128-14.0
  • Legacy: esr115-13.5

Backporting

Timeline

  • No Backport (preferred): patchset for the next major stable
  • Immediate: patchset needed as soon as possible
  • Next Minor Stable Release: patchset that needs to be verified in nightly before backport
  • Eventually: patchset that needs to be verified in alpha before backport

(Optional) Justification

  • Emergency security update: patchset fixes CVEs, 0-days, etc
  • Censorship event: patchset enables censorship circumvention
  • Critical bug-fix: patchset fixes a bug in core-functionality
  • Consistency: patchset which would make development easier if it were in both the alpha and release branches; developer tools, build system changes, etc
  • Sponsor required: patchset required for sponsor
  • Localization: typos and other localization changes that should be also in the release branch
  • Other: upstream backport that fixes a slightly annoying problem with PDFs. It had a regression upstream (which was cherry-picked as well). I believe the number of affected users should be small enough, as it's a combination of settings that is known for causing breakage.

Issue Tracking

Review

Request Reviewer

  • Request review from an applications developer depending on modified system:
    • NOTE: if the MR modifies multiple areas, please /cc all the relevant reviewers (since Gitlab only allows 1 reviewer)
    • accessibility : henry
    • android : clairehurst, dan
    • build system : boklm
    • extensions : ma1
    • firefox internals (XUL/JS/XPCOM) : jwilde, ma1
    • fonts : pierov
    • frontend (implementation) : henry
    • frontend (review) : donuts, morgan
    • localization : henry, pierov
    • macOS : clairehurst, dan
    • nightly builds : boklm
    • rebases/release-prep : dan, ma1, pierov, morgan
    • security : jwilde, ma1
    • signing : boklm, morgan
    • updater : pierov
    • windows : jwilde, morgan
    • misc/other : pierov, morgan

Change Description

Fixes the issue reported on MB's GitHub: https://github.com/mullvad/mullvad-browser/issues/368.

Thorin found an upstream fix and that that fix caused a regression. I cherry-picked both (f384fcaaefbb0afd74200c141f876cc60ed68d10, 9cd09c262454cfb70462a8c4b68f3a844105db0d).

Upstream:

How Tested

Built and verified the problem as described disappeared.

Merge request reports