561e7aea5b
1821: Macro completion tweaks r=matklad a=SomeoneToIgnore Thanks @uHOOCCOOHu for making the macro completion happen :) I've added a few tweaks to the current completion to make it a bit more convenient: * Automatically add braces and put the editor cursor inside of them: <img width="159" alt="image" src="https://user-images.githubusercontent.com/2690773/64737220-022b9f00-d4f5-11e9-8088-76d4678921ab.png"> Currently I have to add the braces manually which is a bit cumbersome. One further improvement can be to detect if macro accepts no parameters and place the cursor differently for this case. * Add an exclamation mark to the macro completion label This helps to distinguish macros from other completion items and also allows to show only macros in completion if you type `!`: <img width="722" alt="image" src="https://user-images.githubusercontent.com/2690773/64736987-8b8ea180-d4f4-11e9-8355-2ce4f83b7aa8.png"> <img width="732" alt="image" src="https://user-images.githubusercontent.com/2690773/64737214-ffc94500-d4f4-11e9-946e-1ba2db1c7fb1.png"> Additionally, automatic formatting hooks had adjusted two `help.rs` files, I've added them as a last commit to the PR even though they are not really related. Co-authored-by: Kirill Bulatov <mail4score@gmail.com>
