[Bug 1632194] [NEW] To much scrollbar padding to the right

[Hans109h]

Public bug reported:

Padding on all scrollbars in Thunderbird does not allow the mouse to
click the scrollbar button when all the way to the right of the screen.
Clicking in the trough results in erratic scrolling.

I was able to fix this behavior in Firefox by creating a
~/.mozilla/firefox/<your profile>/chrome/userChrome.css file and adding
"hbox#browser { margin-right: -1px !important; }".  How can I add this
setting to Thunderbird?

  Application Basics

    Name: Thunderbird
    Version: 50.0
    User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:50.0) Gecko/20100101 Thunderbird/50.0
    Profile Directory: Open Directory

              (Local drive)
    Application Build ID: 20161009150521
    Enabled Plugins: about:plugins
    Build Configuration: about:buildconfig
    Memory Use: about:memory
    Profiles: about:profiles

  Mail and News Accounts
    account2:
      INCOMING: account2, , (none) Local Folders, plain, passwordCleartext

    account4:
      INCOMING: account4, , (imap) mail.tds.net:993, SSL, passwordCleartext
      OUTGOING: , smtp.tds.net:587, alwaysSTARTTLS, passwordCleartext, true

    account5:
      INCOMING: account5, , (imap) mail.tds.net:993, SSL, passwordCleartext
      OUTGOING: , smtp.googlemail.com:465, SSL, passwordCleartext, true

    account6:
      INCOMING: account6, , (imap) imap.tds.net:143, alwaysSTARTTLS, passwordCleartext
      OUTGOING: , smtp.tds.net:587, alwaysSTARTTLS, passwordCleartext, true

    account7:
      INCOMING: account7, , (imap) imap.tds.net:143, alwaysSTARTTLS, passwordCleartext
      OUTGOING: , smtp.tds.net:587, alwaysSTARTTLS, passwordCleartext, true

  Extensions
    Manually sort folders, 1.1.1, true, tbsortfolders at xulforum.org
    Provider for Google Calendar, 3.1, true, {a62ef8ec-5fdc-40c2-873c-223b8a6925cc}
    Messaging Menu and Unity Launcher integration, 1.3.1, false, messagingmenu at mozilla.com

  Important Modified Preferences

    Name: Value

      browser.cache.disk.capacity: 358400
      browser.cache.disk.filesystem_reported: 1
      browser.cache.disk.smart_size_cached_value: 358400
      browser.cache.disk.smart_size.first_run: false
      browser.cache.disk.smart_size.use_old_max: false
      extensions.lastAppVersion: 50.0
      font.internaluseonly.changed: true
      mail.openMessageBehavior.version: 1
      mailnews.database.global.datastore.id: be168405-b0fd-4f37-88c7-8876db36888
      mailnews.database.global.views.conversation.columns: {"threadCol":{"visible":true,"ordinal":"1"},"flaggedCol":{"visible":true,"ordinal":"3"},"attachmentCol":{"visible":false…
      media.gmp.storage.version.observed: 1
      network.cookie.prefsMigrated: true
      network.predictor.cleaned-up: true
      places.database.lastMaintenance: 1475803695
      places.history.expiration.transient_current_max_pages: 102691
      plugin.importedState: true
      plugin.soname.list:

  Graphics

      GPU #1
      Description: Intel Open Source Technology Center -- Mesa DRI Mobile Intel® GM45 Express Chipset
      Vendor ID: Intel Open Source Technology Center
      Device ID: Mesa DRI Mobile Intel® GM45 Express Chipset
      Driver Version: 2.1 Mesa 12.0.3

      Features
      WebGL Renderer: Intel Open Source Technology Center -- Mesa DRI Mobile Intel® GM45 Express Chipset  -- 2.1 Mesa 12.0.3

      AzureCanvasBackend: skia
      AzureCanvasAccelerated: 0
      AzureFallbackCanvasBackend: none
      AzureContentBackend: cairo
      CairoUseXRender: 0

  JavaScript

  Incremental GC: 1

  Accessibility

    Activated: 0
    Prevent Accessibility: 0

  Library Versions

      Expected minimum version
      Version in use

      NSPR
      4.12
      4.12

      NSS
      3.26.1
      3.26.1

      NSS Util
      3.26.1
      3.26.1

      NSS SSL
      3.26.1
      3.26.1

      NSS S/MIME
      3.26.1
      3.26.1

** Affects: thunderbird (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1632194

Title:
  To much scrollbar padding to the right

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