[Enhancement] Unify behavior when a folder is selected

[goran-w]

• When selecting a folder in Local Changes (Show as filesystem tree), the page "Select file to view changes" is displayed.
  • Special-case: when the selected folder has only a single file/item listed beneath it, that file's content is displayed instead. This breaks the pattern and can be a bit confusing to the user. IMHO, it would be better to be consistent and always show the same kind of page for a folder!
• When selecting a folder in History - Files (for a commit in log-graph), then an empty page is displayed. This is inconsistent with how the filesystem tree behaves in Local Changes. A simple fix for this would be to re-use the same page as in Local Changes, but simply replace its text with "Select file to view contents" (based on some input-param isChangeList or similar).
  • (It also doesn't have the single-file special-case from that other view, which IMHO is a good thing...)
• NOTE: An alternative solution would be to always display a (new) page "Folder" (+ folder-icon) when a folder is selected.

[Mingun]

If implement, I think, this feature should be configurable.

[goran-w]

If implement, I think, this feature should be configurable.

Which part(s) of it? Showing 'something' instead of just an empty page won't need to be optional, I think? Presumably it's the special-case for single-file-content you want to optionally preserve? (And if so, why would it be preferable to the more consistent behavior of always displaying exactly what's selected?)

[Mingun]

Checkbox with the meaning "Show file content when there is only one file in a folder when folder is selected"

[goran-w]

Checkbox with the meaning "Show file content when there is only one file in a folder when folder is selected"

Right. When/why would this be preferable, then? (I mean the feature itself, not the checkbox. I'm just curious, since I don't really see the point - I rather find it confusing, as it doesn't match my selection and when I navigate down into the folder there's no change in the content shown... Also, a single-file-folder is a relatively rare special-case and this feature breaks the expected behavioral pattern.)

[Mingun]

If it exists, it was add for purpose, I believe. Therefore, it is probably better to leave the setting -- someone needed it.