Navigation to next same and different styles on a page with Foto in a pdf document: NVDA throws a list index error and the offset is too big for the buffer, causing NVDA to be silent.

[Adriani90]

Steps to reproduce:

1. Open NVDA
2. Assign [ and shift+[ for different style navigation
3. Assign ] and shift+] for same style navigation
4. Open the attached pdf document with adobe Reader
5. Switch to a page which contains only a foto, e.g. page one, two or four
   annual-report-2022-en.pdf
6. Press the assigned commands for navigating to next and previous text styles

Actual behavior:

NVDA gives a list index error, and the offset is too big for the buffer when attempting to navigate to next different or next same style text.

IO - inputCore.InputManager.executeGesture (23:01:47.223) - winInputHook (10508):
Input: kb(laptop):ü
DEBUGWARNING - RPC process 23548 (Acrobat.exe) (23:01:47.223) - Dummy-11 (1624):
Thread 20588, build\x86_64\vbufBase\storage.cpp, VBufStorage_buffer_t::getLineOffsets, 1068:
Offset of 0 too big for buffer, returning false

ERROR - scriptHandler.executeScript (23:01:47.223) - MainThread (19244):
error executing script: <bound method BrowseModeTreeInterceptor.addQuickNav.<locals>.<lambda> of <virtualBuffers.adobeAcrobat.AdobeAcrobat object at 0x0A20F190>> with gesture 'ü'
Traceback (most recent call last):
  File "scriptHandler.pyc", line 295, in executeScript
  File "browseMode.pyc", line 558, in <lambda>
  File "browseMode.pyc", line 516, in _quickNavScript
  File "browseMode.pyc", line 2395, in _iterTextStyle
IndexError: list index out of range
IO - inputCore.InputManager.executeGesture (23:01:47.678) - winInputHook (10508):
Input: kb(laptop):shift+ü
IO - speech.speech.speak (23:01:47.679) - MainThread (19244):
Speaking ['No previous different style text']
IO - inputCore.InputManager.executeGesture (23:01:48.404) - winInputHook (10508):
Input: kb(laptop):plus
DEBUGWARNING - RPC process 23548 (Acrobat.exe) (23:01:48.404) - Dummy-11 (1624):
Thread 20588, build\x86_64\vbufBase\storage.cpp, VBufStorage_buffer_t::getLineOffsets, 1068:
Offset of 0 too big for buffer, returning false

ERROR - scriptHandler.executeScript (23:01:48.404) - MainThread (19244):
error executing script: <bound method BrowseModeTreeInterceptor.addQuickNav.<locals>.<lambda> of <virtualBuffers.adobeAcrobat.AdobeAcrobat object at 0x0A20F190>> with gesture 'plus'
Traceback (most recent call last):
  File "scriptHandler.pyc", line 295, in executeScript
  File "browseMode.pyc", line 558, in <lambda>
  File "browseMode.pyc", line 516, in _quickNavScript
  File "browseMode.pyc", line 2395, in _iterTextStyle
IndexError: list index out of range
IO - inputCore.InputManager.executeGesture (23:01:48.733) - winInputHook (10508):
Input: kb(laptop):shift+plus
IO - speech.speech.speak (23:01:48.733) - MainThread (19244):
Speaking ['No previous same style text']

Expected behavior:

NVDA should report "no next different style text" or "no next same style text". This works as expected for previous styles commands.

NVDA logs, crash dumps and other attachments:

n/a

System configuration

NVDA installed/portable/running from source:

Installed

NVDA version:

Version: alpha-31612,3d4aOa8f (2024.2.0.31612)

Windows version:

Windows 11 23 H2

Name and version of other software in use when reproducing the issue:

Adobe acrobat reader Continuous Release I Version 2024.002.20687 1 64-Bit

Other information about your system:

n/a

Other questions

Does the issue still occur after restarting your computer?

yes

Have you tried any other versions of NVDA? If so, please report their behaviors.

n/a

If NVDA add-ons are disabled, is your problem still occurring?

yes

Does the issue still occur after you run the COM Registration Fixing Tool in NVDA's tools menu?

yes

[Adriani90]

cc: @mltony

[seanbudd]

@mltony - we may need to revert this feature over this issue if this issue isn't fixed in beta

[mltony]

This is fixed in #16430.