improve: git grep gets SDL Error (#<SDL-SURFACE {#X00000000}>): Text has zero width or crash the lem.

[sakurawald]

To reproduce:

1. Run git clone [email protected]:lem-project/lem-project.github.io.git
2. Reset the HEAD to d5e3548aef9eadf2ed36fb274c4105a9344b39e6.
3. Open the project using lem.
4. Run lem/grep::project-grep with arg git grep -niHi 'grep'.
5. Get the error.

[sakurawald]

It seems like the big js file causing the error, or some problems about the string escape.

[sakurawald]

Another interesting command: Run lem/grep::project-gre with git grep -nHI 'webpack'.
And the lem will crash directly without any error message.

[funk443]

To reproduce:

1. Run `git clone [email protected]:lem-project/lem-project.github.io.git`

2. Reset the `HEAD` to `d5e3548aef9eadf2ed36fb274c4105a9344b39e6`.

3. Open the project using `lem`.

4. Run `lem/grep::project-grep` with arg `git grep -niHi 'grep'`.

5. Get the error.

This should be fix by #1741.

Another interesting command: Run lem/grep::project-gre with git grep -nHI 'webpack'. And the lem will crash directly without any error message.

I believe this is because Lem cannot handle so many super long lines.