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Showing content from https://github.com/jrblevin/markdown-mode/issues/747 below:

cell value that starts with a hyphen (-) is misinterpreted as horizontal separator · Issue #747 · jrblevin/markdown-mode · GitHub

When the first cell in a table row has a value that begins with a hyphen,
table realignment should not treat that value as anything special.

Table realignment misrecognizes the cell value as a row separator and replaces all cells in the row with a row separator, losing the row contents in the process.

This is clearly a bug. The documentation states:

No padding is allowed between the beginning pipe character and header separator symbol.

In my use case, the pipe character is separated by one (or more) spaces from the -, so
according to the above, it should not be recognized as a row separator.

(as to why my cell values begin with a hyphen: I'm attempting to document command line options
of a program using a markdown table)

1. open a markdown-mode buffer
2. enter the following table:

|---|---|
| A | B |
|---|---|
| -c  | some text  |

1. place the cursor anywhere on the last line of the table (the one with the -c)
2. press TAB (or perform any action that causes table to be realigned)

The result of the above action will look like this:

|---|---|
| A | B |
|---|---|
|---|---|
|   |   |

There is no backtrace, the mode just does the wrong thing.

Markdown Mode: 2.6-alpha
Emacs: 28.2 (using the version from https://emacsformacosx.com/)
OS: macOS Monterey 12.6.3

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