options: add matchbracestyle (#2876)

* Update docs to include `matchbracestyle`

* Add `matchbracestyle` to infocomplete.go

* Add validator and default settings for `matchbracestyle`

* Highlight or underline braces based on `matchbracestyle`

* Add `match-brace` to default colorschemes

* Correct `FindMatchingBrace()` counting

Make brace under the cursor have priority over brace to the left in
ambiguous cases when matching braces

Co-authored-by: Dmitry Maluka <dmitrymaluka@gmail.com>

* Fix conflicts

---------

Co-authored-by: Jöran Karl <3951388+JoeKar@users.noreply.github.com>
Co-authored-by: Dmitry Maluka <dmitrymaluka@gmail.com>

internal/display/bufwindow.go

@@ -407,7 +407,9 @@ func (w *BufWindow) displayBuffer() {
 					if found {
 						matchingBraces = append(matchingBraces, mb)
 						if !left {
-							matchingBraces = append(matchingBraces, curLoc)
+							if b.Settings["matchbracestyle"].(string) != "highlight" {
+								matchingBraces = append(matchingBraces, curLoc)
+							}
 						} else {
 							matchingBraces = append(matchingBraces, curLoc.Move(-1, b))
 						}
@@ -557,7 +559,15 @@ func (w *BufWindow) displayBuffer() {
 
 					for _, mb := range matchingBraces {
 						if mb.X == bloc.X && mb.Y == bloc.Y {
-							style = style.Underline(true)
+							if b.Settings["matchbracestyle"].(string) == "highlight" {
+								if s, ok := config.Colorscheme["match-brace"]; ok {
+									style = s
+								} else {
+									style = style.Reverse(true)
+								}
+							} else {
+								style = style.Underline(true)
+							}
 						}
 					}
 				}