New line in code block not working correctly

[maltebp]

Description

Inserting a new line (press Enter) on an empty line in a code block does not work correctly. To begin with it seem to do nothing, but if you start typing something afterwards it jumps to the new a line.

Steps to reproduce

1. Open new document
2. Insert code block
3. Move into the code block (ignore language identifier)
4. Press Enter
5. Press d (or any other letter)

Expected behavior:
A new line should be added in step 4, but it's not added until step 5 (line is added first and then the letter is added)

Actual behavior:
New line should be added immediately in step 4 (when pressing enter)

Example:

Note: first part is repro, second part is some of the shenanigans mentioned below

Versions

• MarkText version: 0.16.3 (and pre-release v0.17.0-rc.1)
• Operating system: Windows 10 Home, 10.0.19042 Build 19042

Additional notes:

There seems to be a bunch of issues with the code block that may be related to this problem such as:

• Deleting what you entered after step 5 will also delete the empty line.
• Adding new lines and deleting existing ones (just in some random order) will cause it to behavior strangely (e.g. jump to beginning of code block)
• Switching to source code mode and back will some times delete all empty lines.
• Press the Up arrow key will move you directly the language identifier (and not to line above)

But I think they may fixed by extension of fixing this bug. Let me know if you want dedicated issues on those though.

[jekyllgrim]

I think my issue may be related.
Pressing Enter at the end of a code block mysteriously moves some characters from the curernt line to the next line. The issue resolves itself if I put the cursor at the end of a line that isn't indented and press Enter there. But it can reappear, and I don't have definitive STR.