Make the build addon check pass

[serrebidev]

Problem

The build addon check has never passed for this repo. It fails on master, on every PR, and on all five of the most recent workflow runs — so every pull request arrives with a red X that says nothing about the pull request.

Running the CI step locally (SKIP=no-commit-to-branch pre-commit run --all-files) on a clean master checkout reproduces it. Six hooks fail:

hook	why
trim trailing whitespace	pre-existing
fix end of files	readme.md has a trailing blank line
Add trailing commas	pre-existing
lint with ruff	16 errors (11 bare except:, plus E711/E701/F401/F841)
format with ruff	19 files unformatted
type check with pyright	34 errors — cannot resolve controlTypes, buildVersion, versionInfo

Fix

Four commits, separated so the mechanical noise is reviewable apart from the real changes:

1. Lint fixes — 16 lines across 3 files. The only behavioural change in the whole PR.
2. ruff-format + add-trailing-comma — mechanical, no behaviour change.
3. Skip pyright in CI — see below.
4. readme.md — drop a trailing blank line.

On pyright

I did not make pyright pass; I skipped it, matching what .pre-commit-config.yaml already does for pre-commit.ci ("Pyright does not seem to work in pre-commit CI").

The config points pyright at ../nvda/source, which CI never checks out. I tested the obvious fix — checking NVDA out so the imports resolve. It makes things much worse: errors go from 34 to 2357, because typeCheckingMode = "strict" demands annotations this add-on doesn't have. Making pyright meaningful here means a typing pass over the whole add-on, which is a separate project. Skipping it is the only thing that unblocks the check today.

On the behavioural change

The 11 bare except: clauses become except Exception:. Both add-on exception types (noColumnAtIndex, columnAtIndexNotVisible) derive from Exception, as do COMError and watchdog.CallCancelled, so the same errors are still caught — only KeyboardInterrupt/SystemExit stop being swallowed. The E711 change (index == similar != None → is not None) is over ints from positionInfo, so it's equivalent.

Verification

I can't run NVDA in CI, so I verified statically rather than by clicking through lists:

• AST comparison of every module, before vs after. 8 of 11 files are provably identical. The 3 that changed contain exactly the intended edits and nothing else. Only these functions differ: getColumnData, isEmptyList, isMultipleSelectionSupported, preCheck, reportListBounds, script_find, getScriptGestures, onInstall. Every other command — including script_readListItems (read all items), script_readColumn, script_itemInfo, script_manageHeaders, script_reportEmpty — is untouched.
• xgettext output is byte-for-byte identical to master. This one caught a real bug: reformatting split several _() calls across lines, which detached 9 # Translators: comments and silently dropped them from the .pot. Commit 2 moves each comment to sit directly above its message string, which restores the pot exactly.
• pre-commit run --all-files is green and stable at a fixpoint.

Testing in a real list by someone running the add-on would still be welcome, particularly around script_find on NVDA ≤ 2020.3.

Note on #50

This conflicts with #50, which touches getFixedNum in a region this reformats. Happy to rebase #50 on top of this once you've picked an order — or to drop/split any of these commits if you'd rather not take the formatting churn.