https://bugs.webkit.org/show_bug.cgi?id=72830

Reviewed by Martin Robinson.

Source/WebCore:

Fix issue getting the exposed text for an accessibility object at,
before of after a given offset, after changing it at least once.

* accessibility/gtk/AccessibilityObjectWrapperAtk.cpp:
(webkit_accessible_class_init): Don't initialize
gailTextUtilQuark, it won't be used anymore.
(getGailTextUtilForAtk): Don't cache the GailTextUtil as object
data, but create a new one each time this function is called.
(webkit_accessible_text_get_caret_offset): Simplified code by
using the new focusedObjectAndCaretOffsetUnignored function,
instead of the old objectAndOffsetUnignored function.
(focusedObjectAndCaretOffsetUnignored): Rewrite of the old
objectAndOffsetUnignored function so it now needs less
parameters than before and takes care of carefully selecting the
start and end visible positions to calculate the position of the
caret from the point of view of the accessibility object of
reference passed as the only input parameter now. Updated callers.
* accessibility/gtk/AccessibilityObjectWrapperAtk.h:

* editing/gtk/FrameSelectionGtk.cpp:
(WebCore::FrameSelection::notifyAccessibilityForSelectionChange):
Simplified code by calling to focusedObjectAndCaretOffsetUnignored
function, instead of the old objectAndOffsetUnignored function.

Source/WebKit/gtk:

Updated unit tests to check that both getting the current position
for the caret and the exposed text at, before or after a given
offset for an accessible object works as expected.

* tests/testatk.c:
(runGetTextTests): For objects implementing AtkEditableText, try
to change the exposed text and retrieve it again as a full line.
(testWebkitAtkCaretOffsets): For a text control (a text entry),
set the caret offset to a value greater than 1 and retrieve it.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@104446 268f45cc-cd09-0410-ab3c-d52691b4dbfc