A tab view is useful because visual alignment can hide different underlying characters. One line may contain a single tab byte while another contains four spaces. They can appear to begin in the same column and still behave differently in search, conversion, collaboration, or another editor.
This text editor tab view compare documents guide starts with an 11-character, three-line sample. The command evidence distinguishes one tab byte from one four-space sequence. It does not claim that the CLI measured Rune Studio's rendered tab glyphs or which display setting a reader finds most comfortable.
Identify the data problem behind the alignment
A tab is one character whose displayed width depends on a tab-stop setting. Four spaces are four characters with widths determined by the font. In a monospaced editor with a particular tab width, the two may align. Change the editor, font, export path, or tab width, and the apparent columns can separate.
The correct normalization depends on the line's purpose. A prose manuscript may use a full-width space for paragraph indentation. A TSV file uses tabs as meaningful delimiters. Source code or configuration may assign syntactic meaning to indentation. A table simulated with tabs may need real table structure in the final format.
The dangerous shortcut is a global removal performed immediately after visible markers appear. It may erase delimiters or code indentation along with accidental prose tabs. Visualization locates candidates; it does not supply the editing policy.
Before changing anything, classify the relevant block as prose indentation, delimiter-separated data, code, quotation, or visual alignment. Exclusions belong in the rule, not in a cleanup note written after the replacement.
Build an 11-character sample with both cases
The controlled file was tabs-and-spaces.txt, with SHA-256 fb35864f4110391dcab99c77838fa7bc7e08478a9f3f67d70f139c9b19c4cd40. It contained three lines: one designed to include a tab, one designed to include four consecutive spaces, and one comparison line.
The creation command was rune file write --path /private/tmp/rune-g2c3-studio-307-4iqf12b0/tabs-and-spaces.txt --content-file /private/tmp/rune-g2c3-studio-307-4iqf12b0/.tabs-and-spaces.txt.input --json. It exited with code 0.
Using a tiny sample first protects a real manuscript from an untested rule. It also establishes what the detector counts. If the detector cannot distinguish the two controlled cases, it should not be used to authorize a whole-book replacement.
Record the intended role of each line along with the expected tab and space counts. The same bytes can be correct in a data file and incorrect in a prose paragraph.
Distinguish bytes with the recorded search
The scan command was rune search halfwidth --file /private/tmp/rune-g2c3-studio-307-4iqf12b0/tabs-and-spaces.txt --json. The persisted evidence counted one tab byte and one sequence of four spaces as separate findings.
The file was then read back with rune file read --path /private/tmp/rune-g2c3-studio-307-4iqf12b0/tabs-and-spaces.txt --json. The result reported UTF-8, LF, 11 characters, and three lines. Its checksum tied the readback to the same sample used by the scan.
The acceptance claim is intentionally narrow: the underlying sample contains distinguishable tab and four-space cases. It is not “the tab arrow looked correct” or “18-point text was easier to read.” Those would require visual evidence.
If the scan returns no tab, return to sample creation and verify that the input contains an actual U+0009 character rather than the two characters backslash and t. If it finds unexpected four-space runs, inspect which line introduced them instead of changing the expected count.
Write a normalization rule for each content role
For prose indentation, a rule might target only a tab at the beginning of ordinary paragraph lines and convert it to the site's approved indentation. It should exclude code blocks, quotations, and tabular data. For TSV data, preserving the tab is the rule.
For visual tables, decide whether the output format supports semantic table markup. Replacing tabs with a guessed number of spaces may align one font while failing in another. The correct result may be a real table or a deliberately non-tabular list.
Apply the rule to a copy. Recount tab bytes and four-space sequences afterward, then inspect every changed content role. A zero tab count is not automatically a pass if a delimiter file was included.
If the replacement scope was too broad, discard the copy, narrow the selectors, and try again. Do not reverse a large replacement manually in the authority; that makes it difficult to prove that every unintended edit was restored.
Separate Rune Studio display features from CLI evidence
Rune Studio's public documentation describes editing symbols, line numbers, counts, highlighting, font size, and line spacing. Visible tab and space markers can help an editor locate suspicious alignment while reading.
The command run above measured underlying characters, encoding, line endings, character count, and line count. It did not inspect the pixels used for a tab marker, marker color, tab-stop width, linked-scroll position, or perceived readability. Documentation can establish feature scope, while a visual test would be needed for appearance.
Readability is personal and varies by manuscript. No single font size, line spacing, or marker choice is guaranteed for every editor. Treat display settings as diagnostic aids rather than proof of the stored content.
Normalize by intent, not appearance
The final record should identify the source checksum, content role, tab count, four-space count, approved rule, and post-change readback. Those fields explain why a particular instance changed or remained.
Review the current Rune Studio feature scope for the documented Mac display tools. Prove the distinction on the three-line copy first, then apply a role-specific rule to the manuscript only after the failure and rollback paths are clear.