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I am about to review and test, including live testing on Windows, with an eye to merging before the Monday midnight deadline for the coming releases. At the moment I have no personal preference, nor insight into likely user perferences.
Tal, what is your rationale for the proposal? Personal preference? Do you think a majority of user will prefer this? Have you hand-tested (or htested) on both Mac and Linux?
Cheryl, what do you think?

I did a review on the PR which probably answers your question, but I'll summarize here.
I think consistency in the windows would be good. Consistency would include (but not limited to) foreground and background color, font style, font size, and behavior such as resizing. If a user has changed to a dark theme with a font size of 20, then opening up the help or find windows should use that.
So, I think this is a good suggestion, but I think it should be considered within a larger scope.

Investigating the code, I discovered that
 # TODO: get fg/bg from theme."
is my rewrite on 2016 8 31, a3623c8, of
 #elguavas - config placeholders til config stuff completed
Stephen Gava either wrote or modified the file in 2001. Using the config settings was the original intention, and I thought two years ago and in subsequent revisions that we should at least try it.

After live testing, I like 'after' at least as well as 'before'. I also decided that people who selects a dark theme because black on white is obnoxious to their eyes should have their choice on all text panes.

The first follow-up, #34774, makes the help viewer use the current theme. It would be good if it were separately tested on Linux/Mac, as it uses multiple tags.

New changeset c87d9f406bb23657c1b4cd63017bb7bd7693a1fb by Miss Islington (bot) (Tal Einat) in branch 'master':
bpo-34548: IDLE: use configured theme colors in TextView (GH-9008)
https://github.com/python/cpython/commit/c87d9f406bb23657c1b4cd63017bb7bd7693a1fb

New changeset aeadf59e457ca0ee20983eb1ed78b348f0b453e3 by Miss Islington (bot) in branch '3.7':
bpo-34548: IDLE: use configured theme colors in TextView (GH-9008)
https://github.com/python/cpython/commit/aeadf59e457ca0ee20983eb1ed78b348f0b453e3

New changeset 6b48f9854e2ae35fd74bcd359451eb37ae65f798 by Miss Islington (bot) in branch '3.6':
bpo-34548: IDLE: use configured theme colors in TextView (GH-9008)
https://github.com/python/cpython/commit/6b48f9854e2ae35fd74bcd359451eb37ae65f798

Thanks for the review, discussion and approval, Cheryl and Terry!

I removed 2.7 because I stopped routinely backporting to 2.7 some time ago because a) renaming files (which could not be backported) and using ttk widgets (ditto) made it much harder, and b) it was empirically too easy to introduce regressions without *thorough* hand testing. Given that most beginners now start with 3.x, I prefer merging more patches for current 3.x.