Based on the investigation so far, I think this happens when selecting the first item both in the check-select mode or single-select mode.

<files-triage>

I'm triaging a11y bugs. 

I have reproduced this bug. I'm not fixing this yet, I'll came back to it later.

The issue depends on the view mode (list view or thumbnail view).

List view: it indeed can read more than once and can also include the file name and other columns (Size, Type and Date Modified).

Thumbnail: It doesn't read the file name upon selection.

Upon further investigation, the double read is actually a feature of Chromevox.

First it reads what was focused and when double tapped it actually issues the "click", which finally selects the file, then Chromevox reads that the file has been selected.

An potential improvement is to reduce the text read on list view, to only read the file name instead of reading all columns, but having all info read is also useful, thus I'm NOT changing this.

I noticed an tap issue when using tap+Chromevox on thumbnail view which I'm fixing here. See attachment for fix in action.

Deleted: Mar 26, 2018 7_22 PM.webm 2.8 MB

	Mar 26, 2018 7_22 PM.webm 2.8 MB View Download

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/ea06a0aca66f1f5b3589e6bacb010b6f475526b8

commit ea06a0aca66f1f5b3589e6bacb010b6f475526b8
Author: Luciano Pacheco <lucmult@chromium.org>
Date: Wed Mar 28 00:00:19 2018

A11y add aria label on image on thumbnail view

Add id attribute for element that contains the file/directory name to be
able to use as label on thumbnail image.

Add aria-labelledby attribute to allow Chromevox/screen reader to read
file/directory name when the file is selected via tap on thumbnail.

See  crbug.com/762748#c13  for screencast of fix in action.

Bug:  762748 
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: Ida1410d0ce99ad69f6857a61c508c160f7cedd05
Reviewed-on: https://chromium-review.googlesource.com/979898
Reviewed-by: Sasha Morrissey <sashab@chromium.org>
Reviewed-by: Naoki Fukino <fukino@chromium.org>
Commit-Queue: Luciano Pacheco (SYD) <lucmult@chromium.org>
Cr-Commit-Position: refs/heads/master@{#546322}
[modify] https://crrev.com/ea06a0aca66f1f5b3589e6bacb010b6f475526b8/ui/file_manager/file_manager/foreground/js/ui/file_grid.js

The change from  crbug.com/762749  actually changed the behviour of Chromevox for this issue too.

Now it doesn't read the last time for "selected".

I changed to enforce what exact content is used for accessibility for this element.
For list view it adds the |id| of 3 columns entry-name, size and
modified date.

For grid view it only adds the |id| of entry-name.

See screenshot attached.

Deleted: before.png 253 KB

	before.png 253 KB View Download

Deleted: after_list_view.png 218 KB

	after_list_view.png 218 KB View Download

Deleted: after_grid_view.png 237 KB

	after_grid_view.png 237 KB View Download

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/cf7712419dfe0adf9242434c2edda5db4b9c4a82

commit cf7712419dfe0adf9242434c2edda5db4b9c4a82
Author: Luciano Pacheco <lucmult@chromium.org>
Date: Fri Apr 27 03:02:51 2018

Add aria-labelledby to entry element

This enforces the exact text that will be read by Chromevox, before
this patch it was reading the whole text content from the element which
was getting duplicated text.

The attribute aria-labelledby is a list of ids of elements whose
whose content is used as label by screen reader/Chromevox.

For list view it adds the |id| of 3 columns: entry-name, size and
modified date.

For grid view it only adds the |id| of entry-name.

See  crbug.com/762748  for screenshots of this change.

Bug:  762748 
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I58414b4d3115e9854e7599a74da70a5e56060aa4
Reviewed-on: https://chromium-review.googlesource.com/1023501
Reviewed-by: Naoki Fukino <fukino@chromium.org>
Reviewed-by: Sasha Morrissey <sashab@chromium.org>
Commit-Queue: Luciano Pacheco (SYD) <lucmult@chromium.org>
Cr-Commit-Position: refs/heads/master@{#554278}
[modify] https://crrev.com/cf7712419dfe0adf9242434c2edda5db4b9c4a82/ui/file_manager/file_manager/foreground/js/ui/file_grid.js
[modify] https://crrev.com/cf7712419dfe0adf9242434c2edda5db4b9c4a82/ui/file_manager/file_manager/foreground/js/ui/file_table.js

Fixed for grid and list view.