[GTK] REGRESSION(r275810): Several editing/selection tests are flaky

• Component: New Bugs
• Status: RESOLVED FIXED

[Diego Pino]

The following tests are flaky after r275810:

  editing/selection/extend-after-mouse-selection.html [ Failure Pass ]
  editing/selection/extend-selection-backward-at-beginning-of-line-by-sentence-granularity.html [ Failure Pass ]
  editing/selection/extend-selection-backward-at-beginning-of-line-by-word-granularity.html [ Failure Pass ]
  editing/selection/focus-contenteditable-iframe.html [ Failure Pass ]
  editing/selection/getRangeAt.html [ Failure Pass ]
  editing/selection/move-by-word-visually-across-object-element-1.html [ Failure Pass ]
  editing/selection/move-by-word-visually-across-object-element-2.html [ Failure Pass ]
  editing/selection/move-by-word-visually-across-object-element-3.html [ Failure Pass ]
  editing/selection/select-all-user-select-none.html [ Failure Pass ]
  editing/selection/select-out-of-floated-non-editable-02.html [ Failure Pass ]
  editing/selection/select-out-of-floated-non-editable-07.html [ Failure Pass ]
  editing/selection/select-out-of-floated-non-editable-10.html [ Failure Pass ]
  editing/selection/shift-click.html [ Failure Pass ]
  editing/selection/shift-click-includes-existing-selection.html [ Failure Pass ]
  editing/selection/toString-1.html [ Failure Pass ]
  editing/selection/user-select-all-selection.html [ Failure Pass ]
  editing/selection/user-select-all-with-shift.html [ Failure Pass ]
  editing/selection/user-select-all-with-single-click.html [ Failure Pass ]

https://results.webkit.org/?suite=layout-tests&test=editing%2Fselection%2Fextend-after-mouse-selection.html&platform=GTK

To reproduce it's necessary to run all the tests in `editing/selection` (the tests pass if running only the subset of flaky tests).

[Diego Pino]

Gardened in r275927.

[Diego Pino]

This test(s) has been passing constantly for the last 4000 revisions.\n\nTest expectations updated in r287508.\n\nThere are no more test failures filed under this bug.\n\nClosing bug.