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Crashes and bugs: add bisect tutorial (#609)

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@ -56,6 +56,57 @@ First of all, **_READ THE [FAQ PAGE](../FAQ)_**
If your bug is not listed there, you can ask on the Discord server or open an
issue on GitHub.
## Bisecting an issue
"Bisecting" is finding the first _git_ commit that introduced a specific bug or
regression using binary search. This is done in `git` using the `git bisect` command.
First, clone the Hyprland repo if you haven't already:
```sh
git clone --recursive https://github.com/hyprwm/Hyprland
cd Hyprland
```
Start the bisect process:
```sh
git bisect start
```
Enter the first known good commit hash that did not contain the issue:
```sh
git bisect good [good commit]
```
Then, enter the known bad commit hash that does contain the issue. You can simply use HEAD:
```sh
git bisect bad HEAD
```
_git_ will now checkout a commit in the middle of the specified range.
Now, build and install Hyprland:
```sh
make all
sudo make install
```
...and run Hyprland from the TTY.
Try to reproduce your issue. If you can't (i.e. the bug is not present), go back to the
Hyprland repo and run `git bisect good`. If you can reproduce it, run `git bisect bad`.
_git_ will then checkout another commit and continue the binary search.
Build and install Hyprland again and repeat this step until _git_ identifies the
commit that introduced the bug:
```
[commit hash] is the first bad commit
```
## Building the Wayland stack with ASan
If requested, this is the deepest level of memory issue debugging possible.