Only use turndown formatted code if it introduces non-whitespace changes

[GreenGremlin]

Since the local copy of cledit seems to have diverged from the public copy, I assume the local copy of cledit is a fork and that you're ok with modifying it.

This change ensures code pasted from text editors is not formatted improperly.

If there are only white-space changes between the text version and the Turndown formatted version, then we should just use the text version.

Fixes #1364

An alternative solution would be to search the html for html tags that would produce markdown syntax and would not be in code pasted from a text editor. Something like this:

const MARKDOWN_TAG_RE = /<(p|br|h[1-6]|em|i|strong|b|img)(\s|>|\/)/i;

          [...]
          const html = clipboardData.getData('text/html');
          if (html && MARKDOWN_TAG_RE.test(html)) {

If that seems like a preferable solution, I don't mind closing this PR and opening a new one.

[GreenGremlin]

Anything I can do to help get this merged?

[GreenGremlin]

Just checking back in, wondering if I should just close this PR.

[vekien]

@benweet could we get this merged? This is still an issue and makes using code blocks 100% impossible with the current version.

[kkoenen]

Voting to merge this. Need correct code blocks.

//edit; workaround: try adding 4 spaces before every line of code.

[benweet]

Sorry for the late response.
What does this change fix? Can you illustrate the addressed issue?

[GreenGremlin]

Sorry for the late response.
What does this change fix? Can you illustrate the addressed issue?

This change ensures code copy / pasted into Stackedit from a text editor is not mangled.
See #1364 for more info.

[GreenGremlin]

Sorry for the late response.
What does this change fix? Can you illustrate the addressed issue?

Here's a more detailed breakdown of the issue.

Steps to reproduce

1. Open code like javascript in a text editor like VSCode, Sublime, or any editor that supports copy / paste with syntax highlighting. e.g. When you copy / paste code into a word processor it maintains colors and fonts.
2. Copy a block of code.
3. Paste the block of code into Stackedit

Expected Result

The code is pasted in with formatting in-tact.

Actual Result

Indentation is stripped and extra blank lines are added.

[rehmatworks]

@benweet Will you please fix this issue and keep this awesome software usable? @GreenGremlin why was this PR closed? I'm desperately waiting for this fix and your PR seemed a hope.

[GreenGremlin]

Because it's received no attention. I'd love to see this merged, but as far as I can tell this project is no longer maintained.