https://bugs.kde.org/show_bug.cgi?id=399278
Bug ID: 399278
Summary: The highlights for the two trailing spaces in markdown
documents unrecoverably disappear after changing an
related option
Product: kate
Version: 17.12.0
Platform: Ubuntu Packages
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: kwrite
Assignee: kwrite-bugs-n...@kde.org
Reporter: k...@outlook.com
Target Milestone: ---
WHAT SHOULD HAPPEN
In Markdown, two spaces at the end of a line means a line break. A newly
installed Kate will show two underlines `__` indicating the two spaces.
WHAT HAS HAPPENED
The `__` render disappears unrecoverably after changing the option "Highlight
trailing spaces". With that option, Kate will be able to render with a sizeable
dot like `·` for a trailing space.
STEPS TO REPRODUCE
1. A newly installed Kate is required.
2. Create a file and save it as `filename.md` with contents below:
```
This is a line with two trailing spaces (two spaces here ->).
The two trailing spaces means a line break (two spaces here ->).
And this is a line without trailing spaces (no spaces here).
A raw line break in a Markdown file acts a space (no spaces here).
```
3. (EXPECTED RESULT) You will see the highlights like this:
```
This is a line with two trailing spaces (two spaces here ->).__
The two trailing spaces means a line break (two spaces here ->).__
And this is a line without trailing spaces (no spaces here).
A raw line break in a Markdown file acts a space (no spaces here).
```
4. Then tick the checkbox at Setting -> Configure Kate -> (left column) Editor
Component -> Appearance -> (right column) Whitespace Highlighting -> Highlight
trailing spaces. Apply your setting.
5. You will see the highlight like this:
```
This is a line with two trailing spaces (two spaces here ->).··
The two trailing spaces means a line break (two spaces here ->).··
And this is a line without trailing spaces (no spaces here).
A raw line break in a Markdown file acts a space (no spaces here).
```
Well, for now, it seems that Kate does well because it does render the trailing
space with the dot as in the Settings.
BUT, if I want to switch back to the underline rendering, I find it
UNRECOVERABLE.
6. Untick the checkbox at Setting -> Configure Kate -> (left column) Editor
Component -> Appearance -> (right column) Whitespace Highlighting -> Highlight
trailing spaces. Apply your setting.
7. (OBSERVED RESULT) You will find the highlights `__` disappear unrecoverably:
```
This is a line with two trailing spaces (two spaces here ->).
The two trailing spaces means a line break (two spaces here ->).
And this is a line without trailing spaces (no spaces here).
A raw line break in a Markdown file acts a space (no spaces here).
```
MY SPECULATION THAT MAY HELP
The `__` rendering is a part of language-specified highlights and the `·`
rendering is a part of system-wide highlights. This two options are conflict
with each other and adjusting the latter disables the former.
SOFTWARE VERSIONS
KDE Plasma Version: 5.12.6
KDE Frameworks Version: 5.44.0
Qt Version: 5.9.5
Thanks.
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